JP2001201278A - Steam-heating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain steam-heating equipment which can heat an object to be heated with steam of about 100 deg.C in temperature with accurate temperature, without being affected adversely by the air. SOLUTION: The steam-heating equipment is constituted, in such a way that a steam supply pipe 35 for supplying steam is connected to the jacket section 4 of a reaction furnace 3. Then a condensate recovery device 1 is connected to the lower part of the jacket section 4. In addition, the high pressure- operated fluid introducing port 9 of the device 1 is branched, and an ejector 11 is connected to one branched port 19. Moreover, the suction chamber 14 of the ejector 11 is connected to the jacket section 4 via a pipeline 37 and a thermally operated valve 43. Whenever high-voltage steam is supplied to the ejector 11, a suction force is generated in the suction chamber 14 of the ejector 11, and the air in the jacket section 4 is sucked into the ejector 11 and is discharged to the outside.

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 apparatus suitable for a relatively low temperature of about 00 ° 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. In these cases, the object to be heated often causes thermal damage or thermal degradation due to a slight change in temperature, and it is necessary to accurately maintain the heating temperature.

[0002]

2. Description of the Related Art As a conventional steam heating device, for example, a device as disclosed in Japanese Patent Application Laid-Open No. 7-328423 has been used. This is achieved by connecting the steam supply pipe 17 to the nozzle 18, providing two passages 45 and 46 in a suction chamber 44 formed on the outer periphery of the nozzle 18, connecting one passage 45 to the jacket 16, and connecting the other passage 45 to the jacket 16. The valve means 47 is connected to the passage 46.

[0003] By opening the valve means 47, the residual air in the jacket portion 16 is sucked into the suction chamber 44, and the inside of the jacket portion 16 is depressurized. Then, the valve means 47 is closed to open the jacket portion. A low-pressure steam is supplied into the heater 16 so that the object to be heated can be heated with a low-temperature steam of 100 ° C. or less.

[0004]

In the above-described conventional steam heating apparatus, it is possible to perform steam heating by sucking out and removing air remaining in the initial stage of heating. However, air that gradually accumulates during the heating operation is removed. There was a problem that the heating temperature could not be accurately maintained because it could not be eliminated. By setting the heating device in a reduced pressure state, the atmosphere is sucked from each connection portion of the device, and air is accumulated inside the heating portion, and air may be mixed in the supplied heating steam, Air accumulates in the heating section not only at the beginning of heating but also during the heating operation.

Accordingly, an object of the present invention is to provide a steam heating apparatus capable of adjusting a heating temperature with high accuracy by removing accumulated air not only at the beginning of heating but also during a heating operation.

[0006]

In order to solve the above-mentioned problems, the present invention has been made to solve the above-mentioned problems by forming a heating section in a heat exchanger, connecting a steam supply pipe for heating, and generating the heating section. When a condensate recovery device that recovers condensate by pumping with high-pressure operation fluid is connected, the high-pressure operation fluid inlet of the condensate recovery device is branched, and one of the branched inlets is connected to the inside of the condensate recovery device. An ejector is connected to the other of the communicating and branched inlets, and a suction chamber of the ejector and a heating unit of the heat exchanger are connected via valve means.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An ejector is connected to one of the branched high-pressure operating fluid inlets, and a suction chamber of the ejector and a heating section are connected via a valve means. When the fluid is supplied, a suction force is generated in the suction chamber of the ejector, and the air stored in the heating unit can be suctioned through the valve means and discharged to the outside.

[0008] Either during the initial stage of heating or during the heating operation, a suction force is generated by the ejector each time the high-pressure fluid is supplied to one of the high-pressure operation fluid inlets, and the air accumulated in the heating section can be removed by suction.

[0009]

EXAMPLE In this example, an example in which a reactor 3 is used as a heat exchanger as shown in FIG. 1 will be described. A jacket section 4 as a heating section is formed on the outer periphery of the reaction vessel 3 and connected to a steam supply pipe 35. The steam supply pipe 35 is connected to the high-pressure operating fluid introduction port 9 of the condensate recovery device 1 via the pipe 10. The ejector 11 is disposed at a branch port 19 of the high-pressure operating fluid inlet 9 via a pipe 20, and the suction chamber 14 of the ejector 11 and the jacket section 4 are connected via a pipe 37.

A pressure control valve 38 and an on-off valve 39 are attached to the steam supply pipe 35 and connected to the jacket 4. The pressure control valve 38 is set so that the steam pressure, that is, the temperature supplied to the jacket portion 4 becomes a predetermined value.

The lower part of the jacket part 4 and the condensate inlet 2 of the condensate recovery device 1 are connected by a pipe 40 to a valve 41 and a check valve 5.
Connect through. The check valve 5 permits the passage of the fluid only from the jacket portion 4 to the condensate recovery device 1 but does not permit the passage of the fluid in the reverse direction. A condensate feed line 7 is also attached to the condensate return port 6 of the condensate recovery device 1 via a check valve 8. The check valve 8 allows the fluid to pass only from the condensate recovery device 1 to the outside on the condensate pressure feed line 7 side.

The suction chamber 14 of the ejector 11 and the jacket section 4 are communicated by a pipe 37 via an on-off valve 42 and a temperature responsive valve 43. In this embodiment, valve means is constituted by the on-off valve 42 and the temperature responsive valve 43.

In the present embodiment, the temperature responsive valve 43 is an example in which a self-operated temperature control valve is used, and a temperature-sensitive cylinder 44 attached to a location above the jacket portion 4 where air easily accumulates.
Are connected to an actuator section 45 of the temperature responsive valve 43 via a flexible tube 46. The temperature-sensitive cylinder 44 detects a temperature drop inside the jacket portion 4, and the temperature drop causes a volume decrease of the temperature-sensitive fluid inside, which is transmitted through the flexible tube 46 to the actuator portion 45, and the temperature-responsive valve 43 is opened. I do. Conversely, when the temperature in the jacket portion 4 rises, the temperature is detected by the temperature sensing cylinder 44 and the temperature responsive valve 43 is closed.

On the side of the branch port 19 of the high-pressure operation fluid inlet 9 at the upper part of the condensate recovery device 1, a discharge and circulation port 13 for the high-pressure operation fluid is provided and connected to a pipe line 47. The pipe line 47 is connected to a header (not shown) in the same pressure state as the jacket portion 4 or a portion in a lower pressure state than the separate jacket portion 4.

As shown in FIG. 2, the condensate recovery device 1 has a lid 16 attached to a main body 15 with bolts (not shown) to form a fluid chamber 17 therein. A condensate inlet 2 communicating with the fluid chamber 17 is formed at a lower portion of the main body 15, and a condensate return port 6 is formed at a lower portion of the lid 16. The inlet 16 and the discharge circulation port 13 for the steam as the high-pressure operating fluid are formed in the lid 16.

The inlet 9 is branched, and one opening 18 is connected to the fluid chamber 17, and the other opening 19 is connected to the nozzle 12 of the ejector 11 via the passage 20. An inlet valve 21 is arranged between the openings 18 and 19. Inlet valve 2
Reference numeral 1 designates a connecting rod 22 attached below and connected to a float means 23 described later. In the state shown in FIG. 2, the float means 23 is located at the lower end and is not involved in the inlet valve 21, the inlet valve 21 closes the opening 18, and the opening 19 is open.
Steam as a high-pressure operating fluid flows down from the inlet 9 through the opening 19 and the passage 20 to the nozzle portion 12 of the ejector 11,
The state where a suction force is generated in the suction chamber 14 is shown.

The discharge circulation port 13 communicates with the fluid chamber 17 via an exhaust valve 24. An open / close rod 26 is integrally attached to the exhaust valve 24, and when the exhaust valve 24 moves upward, the exhaust circulation port 1
3, the opening valve 19 is also moved upward by the opening / closing rod 26, the opening 19 is closed, the opening 18 is opened, and the introducing port 9 and the fluid chamber 17 are communicated.

The float means 23 in the fluid chamber 17 comprises a spherical hollow float 27, a float arm 28, a float lever 29, a compression coil spring 30, and an auxiliary lever 31, and each is rotatably pin-connected. The lower end of the exhaust valve 24 is attached to the end of the auxiliary lever 31 via a pin 34. When the float arm 28 rotates about the rotation pin 33 of the float means mounting plate 32 mounted on the lid 16 in accordance with the rise and fall of the float 27, the compression coil spring 30 and the auxiliary lever 31 snap and move to the exhaust valve. Reference numeral 24 also moves vertically. Here, the snap movement means that after the center axis of the compression coil spring 30 and the center axis of the auxiliary lever 31 coincide with each other, the spring is rapidly displaced in a direction to release the position.

When the liquid level in the fluid chamber 17 is low and the float 27 is lowered as shown in FIG. 2, the inlet valve 21 opens the opening 19 and steam is supplied to the ejector 11 to generate a suction force. Air is sucked from the jacket portion 4 shown in FIG. In this case, the condensate of the jacket part 4 is
And flows into the fluid chamber 17 of the condensate recovery device 1.

Condensed water accumulates in the fluid chamber 17 and the float 2
7 is snapped and positioned upward, the discharge circulation port 1
3 and the opening 19 of the high-pressure operating fluid inlet 9 are closed, and conversely, the opening 18 of the high-pressure operating fluid inlet 9 is communicated, and the high-pressure steam from the steam supply pipe 35 as the high-pressure operating fluid is collected in the condensate recovery device 1. Then, the condensate inside is returned to the condensate collection destination through the return port 6, the check valve 8 and the pipe 7, and collected.

When the condensed water is fed under pressure from the pipe 7 in this manner, no suction force is generated in the suction chamber 14 because steam is not supplied to the ejector 11.

When the condensate is recovered and the water level in the condensate recovery device 1 drops, the opening 18 of the high-pressure operating fluid inlet 9 is again opened.
Is shut off and the discharge circulation port 13 is opened,
Condensate flows down into the recovery device 1 from the condensate inlet 2.
By repeating such an operation cycle, the condensate recovery device 1 recovers the condensate generated in the jacket portion 4.

In FIG. 1, when heating an object to be heated in the reactor 3, first, steam is supplied from the pressure regulating valve 38 to the jacket portion 4. In this embodiment, a branch pipe 48 and an on-off valve 49 are attached to the conduit 37 so that the initial residual air in the jacket portion 4 can be discharged by opening the on-off valve 49. That is, while the steam is supplied from the pressure regulating valve 38 to the jacket portion 4, the on-off valve 49 is opened to expel and discharge the residual air in the jacket portion 4 by the steam.

When residual air is present in the jacket portion 4, the temperature in the jacket portion 4 has dropped, and the temperature responsive valve 43 is opened, and the suction chamber 14 of the ejector 11 is opened. Each time a suction force is generated, the residual air can be sucked and discharged to the outside. When the inside of the jacket 4 reaches a predetermined temperature, the temperature responsive valve 43 closes and the suction is stopped.

The steam heated in the reactor 3 is condensed and condensed, and flows down into the condensate recovery device 1 through the pipe 40. Further, by supplying heated steam at a predetermined pressure, that is, temperature, into the jacket portion 4 from which air has been removed, the reactor 3 is heated with the steam at the predetermined temperature. For example, the pressure control valve 38
When the steam of 60 ° C below atmospheric pressure is supplied from the
Is heated at 60 degrees C.

When the inside of the jacket portion 4 is set at a pressure lower than the atmospheric pressure, the atmospheric pressure is applied from each connection portion of the jacket portion 4, and a part of the air enters the jacket portion 4,
Alternatively, due to air entrained in the supplied steam,
When the air accumulates in the jacket portion 4, the temperature of the air is reduced by heat radiation, so that the temperature is detected by the temperature sensing cylinder 44, the temperature responsive valve 43 is opened, and the air is sucked into the suction chamber 14 and discharged. As described above, in this embodiment, not only the initial stage of the steam heating device but also the air accumulated during the heating operation can be sucked and discharged to the outside each time the suction force is generated by the ejector 11.

The steam heated in the reactor 3 is condensed and condensed, so that the inside of the jacket 4 is maintained at the initial pressure state. On the other hand, the condensed condensate flows down into the condensate recovery device 1 and is fed to the condensate recovery destination by repeating the above-described operation.

In this embodiment, an example in which the opening / closing valve 42 and the temperature responsive valve 43 are used as the valve means has been described. However, only the opening / closing valve may be used as the valve means. A check valve that allows only the passage of the fluid in the direction of the suction chamber 14 and blocks the passage of the fluid on the opposite side may be used.

[0029]

As described above, according to the present invention, the ejector is connected to one of the branched high-pressure operating fluid inlets, and the suction chamber of the ejector and the heating section are connected via the valve means. When a high-pressure fluid is supplied to one of the operation fluid introduction ports, a suction force is generated in the suction chamber of the ejector, and the air stored in the heating unit is suctioned through the valve means to be removed to the outside, thereby removing the air. The object to be heated can be heated with high temperature accuracy without any adverse effect due to the above.

[Brief description of the drawings]

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Condensate collection | recovery apparatus 2 Condensate inflow port 3 Reaction tank 4 Jacket part 6 Condensate reduction port 9 High-pressure operation fluid introduction port 11 Ejector 14 Suction chamber 18, 19 opening 35 Steam supply pipe 43 Temperature-responsive valve 44 Thermosensitive cylinder

Claims (1)

[Claims] 1. A method in which a heating section is formed in a heat exchanger, a steam supply pipe for heating is connected, and a condensate collection device for collecting condensate generated by heating by pressure feeding with a high-pressure operating fluid is connected. , The high-pressure operation fluid inlet of the condensate recovery device is branched, one of the branched inlets communicates with the inside of the condensate recovery device, and the other branch is connected to an ejector, and the ejector is sucked. A steam heating device, wherein the chamber and the heating section of the heat exchanger are connected via valve means.