JP2001293360A - Steam heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a steam heating apparatus capable of accurately heating an object to be heated to a predetermined temperature by steam of about 100 deg.C. SOLUTION: A steam supply pipe 3 is connected to the jacket part 2 of a reaction vessel 1. A condensed water recovery device 6 is connected to the lower part of the jacket part 2 through an auxiliary heat exchanger 4 and a cooling fluid supply pipe 11 is connected to the auxiliary heat exchanger 4 through a pressure responsive valve 12. The actuator part 18 of the pressure responsive valve 12 is allowed to communicate with the jacket part 2 by a pressure communication pipe. When the pressure in the jacket part 2 rises, the pressure responsive valve 12 is opened and a cooling fluid is supplied to condense excess steam.

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 00 degrees 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 deterioration due to a slight change in temperature, and it is necessary to accurately maintain the heating temperature at a predetermined value.

[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 suctioning out air remaining in the apparatus at an early stage of heating.
When the amount of the supplied steam for heating is constant and the amount of the object to be heated is reduced, the supplied steam becomes excessive than the consumed steam, and the steam pressure increases, that is, There was a problem that the steam temperature would rise.

[0005] Accordingly, an object of the present invention is to provide a steam heating apparatus in which a rise in steam pressure is prevented by preventing an increase in steam pressure and a change in heating temperature is small.

[0006]

In order to solve the above-mentioned problems, the means of the present invention is to form a heating section in a heat exchanger, connect a steam supply pipe for heating, and recover the heat generated by heating. In the connected condensate recovery device for discharging water, an auxiliary heat exchanger communicating with the heating unit is arranged, and a cooling fluid supply pipe for supplying a cooling fluid to the auxiliary heat exchanger is connected,
The cooling fluid supply pipe is provided with a pressure responsive valve that detects pressure fluctuations of the heating unit and opens and closes the valve. When the pressure of the heating unit increases by a predetermined value, the pressure responsive valve opens and the cooling fluid is supplied to the auxiliary heat exchanger. The supplied steam for heat exchange is heat-exchanged.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An auxiliary heat exchanger communicating with a heating unit is arranged, and a cooling fluid supply pipe is connected to the auxiliary heat exchanger via a pressure-responsive valve which opens when the pressure of the heating unit increases by a predetermined value. As a result of the connection, when the amount of steam supplied to the heating unit becomes excessive and the steam pressure rises by a predetermined value, the pressure responsive valve opens and the cooling fluid is supplied to the auxiliary heat exchanger, and the excess steam is discharged. By the heat exchange and the condensation, the pressure increase of the auxiliary heat exchanger and, consequently, the communicating heating section is eliminated, and the temperature increase is also prevented.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, an example in which a reactor 1 is used as a heat exchanger as shown in FIG. 1 will be described. A jacket portion 2 as a heating portion is formed on the outer periphery of the reaction vessel 1 and connected to the steam supply pipe 3, and an auxiliary heat exchanger 4 communicating with a lower portion of the jacket portion 2 and a lower portion of the auxiliary heat exchanger 4. The connected condensate recovery device 6 constitutes a steam heating device.

A pressure control valve 7 is attached to the steam supply pipe 3 and connected to the jacket 2. The pressure control valve 7 is set such that the steam pressure, that is, the temperature, supplied to the jacket 2 becomes a predetermined value. When saturated steam is used as the heating steam, the steam pressure and temperature can be set to a predetermined value, so that the steam temperature can be set to a predetermined value because the steam pressure and temperature are uniquely determined. In addition, the steam supply pipe 3 is connected to an inlet 10 of the high-pressure operating fluid of the condensate recovery device 6 via a pipe 9.

The auxiliary heat exchanger 4 is communicated with the lower part of the jacket part 2 by a pipe 21. The lower part of the auxiliary heat exchanger 4 is connected to the condensate inlet 20 of the condensate recovery device 6 through a check valve 23 through a pipe 22.

The auxiliary heat exchanger 4 is in the form of a closed tank, in which an extended portion of a pipe 21 is arranged in a coil shape and connected to a pipe 22 and a cooling fluid supply pipe 11 is provided at a lower portion with a pressure responsive valve 1.
2 and a cooling fluid discharge pipe 13
Connect. On the other hand, the actuator section 18 of the pressure responsive valve 12 communicates with the jacket section 2 through the pressure communication pipe 19.

In the present embodiment, the pressure responsive valve 12 uses a self-acting pressure regulating valve as shown in FIG.
2, the inlet 30 is connected to the cooling fluid supply pipe 11, and the outlet 31 is connected to the auxiliary heat exchanger 4. A valve body 33 is arranged to face a valve seat 32 that defines an inlet 30 and an outlet 31. The valve body 33 is connected to an upper diaphragm 35 by a connecting rod 34. A tension coil spring 36 for pressure adjustment is disposed above the diaphragm 35. Coil spring 3
6 urges the diaphragm 35 upward. Coil spring 3
6, a rotating handle 38 is provided via an adjusting screw 37.
Attach. By rotating the rotating handle 38 left and right, the adjusting screw 37 moves up and down, and the coil spring 3
The tensile force of No. 6 can be appropriately adjusted.

The lower chamber 39 of the diaphragm 35 has a communication port 4
0 is provided. The communication port 40 communicates with the jacket 2 of the reaction vessel 1 shown in FIG. Therefore, when the pressure in the jacket portion 2 rises, the pressure in the diaphragm lower chamber 39 also rises, and the diaphragm 35 is displaced upward, so that the valve element 33 separates from the valve seat 32 and opens.

When the pressure responsive valve 12 is opened, a cooling fluid such as cooling water is supplied from the cooling fluid supply pipe 11 of FIG. 1 to the auxiliary heat exchanger 4 and exchanges heat with steam in the auxiliary heat exchanger 4. It condenses.

The pressure responsive valve 12 is not limited to the self-actuated pressure regulating valve described above. For example, an automatic regulating valve and a pressure controller having a built-in electric or pneumatic actuator, and a pressure in the jacket portion 2 are controlled. A combination of pressure sensors that can be detected can also be used.

The lower part of the auxiliary heat exchanger 4 and the condensate inlet 20 of the condensate recovery unit 6 are connected by a pipe 22 via a check valve 23. The check valve 23 permits the passage of fluid only from the jacket portion 2 and the auxiliary heat exchanger 4 to the condensate recovery device 6, but does not permit passage of fluid in the reverse direction.
A condensate feed pipe 26 is also attached to the condensate return port 24 of the condensate recovery device 6 via a check valve 25. The check valve 25 allows the fluid to pass only outward from the condensate recovery device 6 to the condensate pressure feed line 26 side.

A discharge circulation port 27 for high-pressure operation fluid is provided on the upper side of the condensate recovery device 6 on the side of the high-pressure operation fluid introduction port 10, and is connected to a pipe 28. The conduit 28 is connected to a header (not shown) in the same pressure state as the jacket portion 2 or to a portion in a lower pressure state than the separate jacket portion 2.

In the condensate recovery device 6, when the float (not shown) disposed inside is located at the lower part, the inlet 10 for the high-pressure operating fluid is closed, while the discharge circulation port 27 is opened, The condensed water in the jacket portion 2 flows down into the collecting device 6 through the auxiliary heat exchanger 4, the check valve 23, and the condensate inlet 20, and the condensed water is collected in the collecting device 6 so that the float rises above a predetermined level. Is located, the discharge circulation port 27 is closed, while the high pressure operation fluid introduction port 10 is opened, and high pressure steam from the steam supply pipe 3 flows into the recovery device 6 as high pressure operation fluid, Return water to return port 24 and check valve 2
5 and the pipe 26 to be conveyed to a condensate water collecting destination under pressure.

When the condensed water is collected and the water level in the collecting device 6 is lowered, the inlet 10 for the high-pressure operating fluid is closed again, and the discharge circulation port 27 is opened. Flows down into the recovery device 6. By repeating such an operation cycle, the condensate recovery device 6 recovers the condensate generated in the jacket portion 2.

In FIG. 1, when heating an object to be heated in the reaction vessel 1, heating steam of a predetermined pressure, that is, a temperature is supplied to the jacket portion 2 from the pressure control valve 7, so that the reaction vessel 1 is heated.
Is heated with steam at a predetermined temperature. For example, when steam of 60 ° C. or lower than the atmospheric pressure is supplied from the pressure control valve 7, the reactor 1 is heated at 60 ° C. The steam that has heated the reactor 1 is condensed and condensed, and flows down into the condensate recovery device 6 through the pipe 21 and the auxiliary heat exchanger 4.

When the amount of steam supplied from the pressure control valve 7 is larger than the amount of steam consumed in the jacket portion 2, the steam flows down not only in the jacket portion 2 but also in the auxiliary heat exchanger 4 thereunder. At the same time, the steam pressure in the jacket 2 increases. The pressure increase in the jacket portion 2 is caused by the pressure communication pipe 19 through the diaphragm lower chamber 39 of the pressure responsive valve 12.
When the diaphragm 35 is displaced upward, the valve body 33 is separated from the valve seat 32, and the cooling fluid is supplied to the auxiliary heat exchanger 4, so that excessive steam in the auxiliary heat exchanger 4 Is condensed by heat exchange. As described above, in the present embodiment, the excess steam flowing down from the jacket portion 2 to the auxiliary heat exchanger 4 is condensed to lower the steam pressure, thereby preventing an increase in the heating steam temperature.

If the amount of steam supplied is not excessive,
The steam that has heated the reactor 1 is condensed and condensed, so that the inside of the jacket portion 2 is maintained at the initial pressure state.
On the other hand, the condensed condensate flows down from the auxiliary heat exchanger 4 into the condensate recovery device 6 and is fed to the condensate recovery destination by repeating the above operation.

In this embodiment, an example is shown in which the auxiliary heat exchanger 4 is disposed between the jacket 2 and the condensate recovery device 6, but the auxiliary heat exchanger 4 is not limited to this position. For example, it can be disposed between the pressure control valve 7 and the jacket 2 or between the upper and lower portions of the jacket 2.

[0024]

As described above, according to the present invention, when the pressure of the heating section rises by a predetermined value, the pressure responsive valve opens to supply cooling fluid to the auxiliary heat exchanger to exchange heat with steam. When the amount of steam supplied to the heating unit becomes excessive due to the condensation and the steam pressure increases, the increased steam is condensed.
Therefore, it is possible to prevent the temperature fluctuation due to the increase in the steam pressure and to accurately heat the object to be heated at the predetermined temperature.

[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 schematic configuration diagram of a pressure responsive valve used in the steam heating device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reactor 2 Jacket part 3 Steam supply pipe 4 Auxiliary heat exchanger 6 Condensate recovery device 10 High pressure operation fluid introduction port 11 Cooling fluid supply pipe 12 Pressure responsive valve 19 Pressure communication pipe 20 Condensate inlet 24 Condensate return port 27 Discharge Circulation port 30 Inlet 31 Outlet 32 Valve seat 33 Valve

Claims (1)

[Claims] 1. A heating unit having a heating unit formed therein, a heating steam supply pipe connected thereto, and a condensate recovery device for discharging condensate generated by heating connected to an auxiliary unit communicating with the heating unit. A pressure responsive device that arranges a heat exchanger, connects a cooling fluid supply pipe that supplies a cooling fluid to the auxiliary heat exchanger, and detects a pressure change of a heating unit in the cooling fluid supply pipe to open and close the valve. A steam heating device, wherein a valve is attached, and when the pressure of the heating section rises by a predetermined value, the pressure responsive valve opens and a cooling fluid is supplied to the auxiliary heat exchanger to exchange heat for heating steam. .