JP3281999B2 - Steam heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for heating an object to be heated in a heat exchanger with steam.
The present invention relates to a steam heating device suitable for a relatively low temperature of about C. Specifically, it is used for steam heating of various reaction vessels used for a polymerization reaction or the like, a distilling apparatus, a concentrating apparatus, or a sterilizing apparatus for food. The heated object in these cases is
In many cases, a slight temperature rise causes thermal damage, and it is necessary to accurately maintain the heating temperature.

[0002]

2. Description of the Related Art A conventional steam heating apparatus, for example, as shown in FIG. 3 has been used. This heats the reaction vessel 1 as a heat exchanger. The jacket 2 is formed on the outer periphery of the reaction vessel 1 as a heating section, and the heating steam supply pipe 3 is connected thereto. A condensate recovery device 4 for discharging condensate is connected, and relatively low pressure, that is, low temperature steam is supplied from the steam supply pipe 3 to the jacket portion 2 to heat the object to be heated in the reactor 1. Is what you do. By heating the steam supplied into the jacket portion 2 to condense and maintain the inside of the jacket portion 2 at a low pressure state of about atmospheric pressure or less, at a relatively low temperature of 100 ° C. or 100 ° C. or less. It can be heated.

[0003] The condensate recovery device 4 is, for example, a Japanese Utility Model Application No. 50-14.
No. 7228, a water level (not shown) is provided in a casing 9 having a condensate inlet 5 and a reducing port 6 and an inlet 7 and a circulation port 8 for a high-pressure operating fluid. A float valve that floats up and down is arranged, and an air supply valve that opens and closes the inlet 7 for the high-pressure operating fluid and an exhaust valve that opens and closes the circulation port 8 for the high-pressure operating fluid are connected to the float. When the inside of the casing 9 is at a low water level, the condensate inlet 5 and the high-pressure operating fluid circulation port 8 are opened by the cooperation of the check valves 10 and 11 disposed at the inlet 5 and the return port 6. Introduce condensate,
When the inside of the casing 9 becomes a high water level, the inlet 7 for the high-pressure operating fluid and the return port 6 for the condensate are opened to introduce the high-pressure operating fluid into the casing 9 and the condensate is pumped to a predetermined recovery destination 12. Things.

[0004]

The above-mentioned conventional steam heating apparatus has a problem that the heating temperature cannot be accurately maintained, particularly a problem that the temperature cannot be accurately controlled in an initial stage of heating. This is because a large amount of air remains in the jacket portion 2 in the initial stage of the heating, which is almost in an atmospheric pressure state, and the supplied heating steam is hardly condensed and the inside of the jacket portion 2 is in a predetermined low pressure state. 10
This is because the steam temperature cannot be adjusted to 0 ° C. or lower.

[0005] The remaining air can be expelled by the supplied steam, but the evacuation takes time and a time delay occurs, so that the temperature cannot be adjusted accurately.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a steam heating apparatus capable of accurately adjusting a heating temperature without causing a time delay.

[0007]

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 steam supply pipe for heating,
Connect a condensate recovery device that discharges condensate generated by heating , and the condensate recovery device pressurizes condensate with high-pressure operating fluid.
In those feed, a nozzle communicating with the steam supply pipe to the inlet side of the heating section, and a suction chamber formed covering the periphery of this the nozzle, and continuously provided at least two passages to those the suction chamber,
The person said one passage while connecting the heating portion of the heat exchanger,
Interposed valve means in the other passage, for opening the valve means
The steam from the steam supply pipe to the nozzle and the valve means
To generate suction force in the suction chamber,
From the heating section and close the valve means.
Between the nozzle and one of the passages
From the heating unit to the heating unit .

[0008]

The operation of the above technical means is as follows.
Since the nozzle, the suction chamber, and the valve means are formed in communication with the steam supply pipe, when the valve means is opened to allow steam to pass through the nozzle, a suction force acts on the suction chamber to reduce the pressure. By connecting the suction chamber and the heating section of the heat exchanger through one of the passages, the residual air in the heating section is sucked into the suction chamber by this suction force and is removed from the valve means together with the steam out of the system. The inside of the heating section is brought into a predetermined low pressure state by removing the residual air. By closing the valve means in this state,
The passage from the steam supply pipe and the nozzle is only one of the passages connected to the heating unit, and the steam exiting the nozzle is supplied to the heating unit. By setting the temperature of the steam supplied to the heating unit to a predetermined temperature, the object to be heated can be heated while maintaining the predetermined temperature even in the case of steam of 100 ° C. or lower.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). In this embodiment, an example in which the reactor 15 is used as a heat exchanger as in the conventional example will be described. A jacket portion 16 is formed on the outer periphery of the reaction vessel 15 and connected to a steam supply pipe 17 via a nozzle 18.
The lower part of the jacket part 16 and the condensate recovery device 20 are connected to the pipe 1
9 to form a steam heating device.

The steam supply pipe 17 has two parallel pipes 40, 4
1 and connected to the nozzle 18. Pressure control valves 21 and 42 and on-off valves 22 and 43 are attached to the conduits 40 and 41, respectively. The pressure control valve 21 is set to have a desired steam temperature to be supplied to the jacket portion 16, and the other pressure control valve 42 is set to a high pressure equal to or higher than the atmospheric pressure. Further, the steam supply pipe 17 is connected to the high pressure working fluid introduction port 38 of the condensate recovery device 20 via the pipe 23.

A suction chamber 44 is formed around the nozzle 18 and two passages 45 and 46 are connected to each other. One passage 45 is connected to the jacket portion 16 and the other passage 46 is connected to the valve means 47.
Connect with The valve means 47 may be any as long as it can open and close the passage. By opening the valve means 47 and the opening / closing valve 43 and passing high-pressure steam from the pressure regulating valve 42 to the nozzle 18, a suction force is generated in the suction chamber 44, and the residual air in the jacket portion 16 via the passage 45. Is to be sucked. Stop supply of high pressure steam and valve means 4
7 is closed, and steam of a desired temperature is allowed to pass through the pressure regulating valve 21, and the jacket portion 1 is passed from the nozzle 18 through the passage 45.
6 is supplied with steam at a desired temperature.

The lower part of the jacket 16 and the condensate recovery device 2
The condensate inflow port 34 is connected to the valve 26 via the check valve 27 via the pipe 19. The check valve 27 permits the passage of the fluid only from the jacket portion 16 to the condensate recovery device 20, but does not permit the passage of the fluid in the reverse direction. The check valve 28 is also provided at the condensate return port 35 of the condensate recovery device 20.
A condensate pressure feed line 29 is attached via. This check valve 2
Numeral 8 is for allowing fluid to pass only from the condensate recovery device 20 to the outside.

FIG. 2 shows the details of the condensate recovery device 20. A lid 32 is attached to the main body 31 with bolts (not shown) to form a condensate sump chamber 33 therein. An inflow port 34 for condensate water is formed in the upper part of the main body 31 to communicate with the condensate sump chamber 33, and a return port 35 for reducing the condensate water to a recovery destination is formed in the lower part. An inlet 38 connected to the steam pipe 23 as a high-pressure operating fluid is formed in the lid 32, and a high-pressure operating fluid circulating port 39 (not shown) is formed behind the inlet 38. The inlet 38 communicates with the condensate sump chamber 33 via the air supply valve 50, and the circulation port 39.
Is communicated with the condensate sump chamber 33 via an exhaust valve 51 (not shown) disposed substantially parallel to the back side of the air supply valve 50. Air supply valve 5
When the slide rod 53 is displaced upward, the air supply valve 50 is opened and the exhaust valve 51 is closed, and when the slide rod 53 is displaced downward, since the slide rod 53 is displaced upward. In this configuration, the air supply valve 50 is closed and the exhaust valve 51 is opened. A plurality of slide rings 5 supporting the vertical movement of the slide bar 53 are provided on both sides of the slide bar 53.
5 is provided.

A closed float 56 which rises and falls with the water level is accommodated in the condensate sump chamber 33. A lever 57 is attached to the float 56, and the connecting member 58 and the valve stem 59 of the valve body 60 are pin-connected to the lever 57. Lever 57 is pin 6
It rotates with the float 56 floating around 1. Auxiliary lever 6 is attached to the end of lever 57 via pin 63.
4 are connected in series. The other end of the auxiliary lever 64 is rotatably attached by a pin 65 attached to the lid 32. One end of the connecting member 58 is connected to the slide bar 53 by a pin 62, and the other end is connected to an auxiliary lever 64 by a pin 66.
A coil spring 67 in a compressed state is arranged at the center of the connecting member 58.

The water and condensate in the jacket portion 16 are supplied through a pipe 19
, And flows down into the condensate sump chamber 33 through the check valve 27 and the check valve 27. When condensed water is collected in the condensate storage chamber 33, the float 56 rises, and the lever 57 rotates about the pin 61. In this case, the pin 66 is displaced downward and the coil spring 6
7 is further compressed. When the pin 66 is further displaced downward and is located slightly below the position of the pin 62, the compressive force of the coil spring 67 acts on the pin 62 and pushes the slide bar 53 upward at a stretch. When the slide rod 53 is located above, the air supply valve 50 is opened and high-pressure steam flows into the condensate sump chamber 33 from the steam line 23 as a high-pressure operating fluid, and is parallel to the back side of the air supply valve 50. The exhaust valve 51 provided in the second chamber is closed to prevent the discharge of high-pressure steam, so that the
The condensate in 3 is pumped to the condensate recovery destination via the return port 35, the check valve 28 and the pipe 29.

When the condensate is collected and the water level in the condensate sump 33 drops, the float 56 descends as shown in FIG.
The supply valve 50 is closed and the exhaust valve 51 is opened to discharge the high-pressure steam in the condensate sump chamber 33 to the outside. When the steam pressure in the condensate sump chamber 33 decreases, the condensate flows down into the condensate sump chamber 33 again through the inlet 34. In this case, the condensate is not discharged from the return port 35 because the valve body 60 is raised to close the passage.

In FIG. 1, when heating an object to be heated in the reactor 15, first, the valve 26 and the on-off valve 22 are closed, and the valve means 47 and the on-off valve 43 are opened. Through the nozzle 18 and the passage 46 to the valve means 47. When high-pressure steam passes through the nozzle 18,
A suction force is generated in the suction chamber 44, and the remaining air in the jacket portion 16 is sucked through the passage 45. The sucked air is discharged to the outside from the passage 46 through the valve means 47. When the air is removed, the on-off valve 43 and the valve means 47 are closed, and the valve 26 and the on-off valve 22 are opened.
The steam adjusted to a predetermined pressure, that is, the temperature in step 1, passes through the nozzle 18, the suction chamber 44 and the passage 45,
Supplied to The steam that has heated the reaction vessel 15 in the jacket portion 16 is condensed and condensed, and flows naturally into the condensate recovery device 20 via the pipe 19. By supplying heated steam at a predetermined temperature into the jacket portion 16 from which air has been removed, the reactor 15 is heated with the steam at the predetermined temperature.
For example, when steam of 60 ° C. is supplied from the pressure control valve 21, the reactor 15 is heated at 60 ° C.

The steam heated in the reactor 15 is condensed and condensed, so that the inside of the jacket portion 16 is maintained at the initial pressure state. On the other hand, the condensed water condensed
The water flows down to 0 and is pumped to the condensate recovery destination by repeating the above operation.

[0019]

As described above, according to the present invention, the valve means is opened to allow steam to pass through the nozzle, thereby generating a suction force in the suction chamber and quickly removing the residual air in the heating section. Therefore, by supplying steam at a predetermined temperature, the object to be heated can be heated without time delay and with high temperature accuracy.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a steam heating device of the present invention.

FIG. 2 is a cross-sectional view of a condensate recovery device used in the steam heating device of the present invention.

FIG. 3 is a configuration diagram showing a conventional example of a steam heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 15 Reaction tank 16 Jacket part 17 Steam supply pipe 18 Nozzle 20 Condensate recovery apparatus 21, 42 Pressure control valve 44 Suction chamber 45, 46 Passage 47 Valve means

Claims (1)

(57) [Claims] 1. A with connecting steam supply pipe for heating forms a heating unit to the heat exchanger, connecting the condensate collecting device for discharging the condensate produced by the heat, the condensate recovery system is high
In those pumps the condensate by the operation fluid, a nozzle communicating with the steam supply pipe to the inlet side of the heating section, and a suction chamber covering the periphery of this the nozzle is formed, at least two passages to those the suction chamber and continuously provided along with an equivalent said one passage connecting the heating portion of the heat exchanger, interposed valve means in the other passage
The valve means is opened to open the valve from the steam supply pipe.
The steam flows down the nozzle and the valve means, and the suction force is applied to the suction chamber.
Is generated and the inside of the heating section is sucked from one of the passages.
The valve means is closed by closing the valve means.
A steam heating device for supplying steam from a nozzle and one of the passages to a heating unit.