JP2002306956A - Steam heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam heating apparatus in which the whole heating part is uniformly heated with steam without retaining a condensate generated in the heating part. SOLUTION: A steam supply pipe 5 is connected to a jacket part 2. A header tank 3 and a condensate forcibly feed pump 4 are connected to the lower part of the jacket part 2. An introducing port 28 for high pressure steam and a supply port 29 for cooling fluid are provided at the upper part of the condensate forcibly feed pump 4. A steam ejector 32 is connected to the upper part of the header tank 3. The high pressure steam is condensed in the condensate forcibly feed pump 4 to make the pressure in the pump 4 negative, and thus the condensate in the jacket part 2 is sucked without being retained.

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 with steam, and more particularly to a steam heating apparatus suitable for a case where the heating temperature is relatively low, such as about 100.degree. 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 due to a slight temperature change, and it is necessary to accurately maintain the heating temperature.

[0002]

2. Description of the Related Art A conventional steam heating apparatus is disclosed in
No. 328422. In this method, a steam supply pipe for heating is connected to the heating section, a condensate recovery device that discharges condensate generated by heating is connected, and a replacement fluid supply pipe that replaces air in the heating section is connected. By removing the air in the heating section by the replacement fluid to reduce the pressure, the steam can be heated at a low temperature of 100 ° C. or less.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
Because the condensate generated in the heating section flows into the condensate recovery device by natural flow based on the head of the inflow water, if the amount of condensate generated fluctuates and increases, the condensate in the heating section is immediately retained without stagnation. There was a problem that the entire heating section could not be uniformly steam-heated because it could not be discharged outside the heating section and a part of the heating section was covered with condensate.

[0004] It is therefore an object of the present invention to provide a steam heating device capable of accurately maintaining a steam heating temperature at a predetermined value without retaining condensate generated in a heating section.

[0005]

Means of the present invention taken to solve the above-mentioned problems are to supply steam to a heating section to heat an object to be heated and to recover condensate generated by heating. A pump for pumping water to a predetermined location by a water pump, comprising a steam supply means for supplying steam for pumping to the condensate pump, and a steam condensing means for condensing steam in the condensate pump. The steam supply means and the steam condensing means are switched according to the liquid level of the condensate in the pump, and the non-condensable gas discharging means for discharging the non-condensable gas accumulated in the heating section to the outside of the system is attached.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS When condensate generated in a heating section reaches a condensate pump and reaches a predetermined liquid level, the steam supply means and the steam condensing means are switched, and the steam supply means is switched from the steam supply means into the condensate pump. Is supplied with high-pressure steam for pumping, and the condensate is pumped to a predetermined location. When the condensate is pumped and reaches a predetermined low liquid level, it is switched from steam supply means to steam condensation means,
The vapor remaining in the condensing pump is condensed and its volume is rapidly reduced, so that the inside of the condensing pump becomes a negative pressure state below the atmospheric pressure. Since the inside of the condensate pump is in a negative pressure state, the condensate generated in the heating section quickly flows down to the condensate pump due to the pressure difference and does not stay in the heating section.

The steam condensing means may be any means capable of condensing the steam in the condensing pump, such as a means for bringing the steam and the cooling fluid into direct contact to condense, or an indirect heat exchange. What is condensed can be used.

[0008] Since the non-condensable gas discharging means is attached to the heating section, the inside of the heating section is mixed with non-condensable gas such as air or the like supplied from outside due to a negative pressure in the heating section or supplied steam. The non-condensable gas that has flowed in is discharged outside by the non-condensable gas discharging means.

As the non-condensable gas discharging means, a temperature sensor or a pressure sensor detects that air or the like has accumulated in the heating section and the temperature has dropped or the pressure has risen, and the vacuum pump is driven. What discharges can be used.

[0010]

EXAMPLE In this example, a reaction vessel 1 was used as a heating section.
2 shows an example of the jacket portion 2 of FIG. In FIG. 1, a condensate pump 4 is connected to a jacket 2 via a header tank 3 to constitute a steam heating device.

[0011] A valve 6 is connected to a steam supply pipe 5 for supplying steam for heating to the jacket section 2. Steam at a predetermined pressure or temperature is supplied from the valve 6 to the jacket portion 2 to heat the object to be heated in the reactor 1 (not shown).

An atmosphere communication pipe 7 is attached to the upper part of the jacket 2 via a valve 8. The header tank 3 is connected to a lower portion of the jacket 2 via a valve 9. The header tank 3 is a tank for temporarily storing condensed water generated in the jacket portion 2.

An automatic valve 31 and a steam ejector 32 are arranged in a pipe 30 branched from the steam supply pipe 5. Steam ejector 32
Is composed of a suction chamber 33 having a nozzle (not shown) therein and a diffuser 34. The suction chamber 33 is connected to the upper part of the header tank 3 via a pipe 35 and a check valve 36. Further, a temperature sensor 37 for detecting the internal temperature is attached to the upper part of the header tank 3 and connected to the automatic valve 31 via a temperature controller (not shown).

When non-condensable gas such as air accumulates in the header tank 3, the temperature sensor 37 detects a decrease in temperature and opens the automatic valve 31 to supply steam to the steam ejector 32. The non-condensable gas inside is sucked and removed to the outside.

In this embodiment, the automatic valve 31, the steam ejector 32 and the temperature sensor 37 constitute a non-condensable gas discharging means. Further, in this embodiment, the example in which the non-condensable gas discharging means is attached to the header tank 3 is shown, but it can be attached to the jacket portion 2.

A lower portion of the header tank 3 is connected to a condensate inlet 12 of the condensate pump 4 by a pipe 11. The replacement fluid supply pipe 1 is connected to the lower side of the tank 3 through a valve 14.
5 is connected.

A valve 21 and a check valve 22 are attached to the pipe 11. The check valve 22 permits the passage of fluid only from the header tank 3 to the condensate pump 4 and does not permit the passage of fluid in the reverse direction. Further, the valve 21 is for adjusting the amount of condensate flowing down to the condensate pressure feed pump 4.

A condensate pressure feed line 26 is connected to a condensate pressure feed port 23 of the condensate pressure feed pump 4 via a check valve 24 and a valve 25. The check valve 24 allows the fluid to pass only from the condensate pump 4 to the condensate feed line 26 in the outward direction.

A steam supply pipe 5 is provided above the condensing pump 4.
Is provided with a high-pressure steam inlet 28 connected to a steam pipe 27 branching off. A cooling fluid supply port 29 is provided on the side of the high-pressure steam introduction port 28. The cooling fluid supply pipe 29 is connected to the cooling fluid supply port 29 via the valve 13. In the present embodiment, the steam pipe 27 and the steam inlet 28 constitute steam supply means, and the cooling fluid supply pipe 17 and the cooling fluid supply port 29 constitute steam condensation means.

The pipe 17 of the cooling fluid supply port 29 is further branched and connected to the header tank 3 via the communication pipe 10 and the valve 16. By opening the valve 16, the pump 4
The inside can be brought into the same pressure state as the inside of the header tank 3.

The condensate pump 4 opens the high-pressure steam inlet 28 and opens the high-pressure steam from the steam pipe 27 when the float (not shown) disposed inside is located at the upper part due to the rise of the liquid level of the condensate. Flows into the pump 4, while the cooling fluid supply port 29 is closed, so that the condensate inside the pump 4 is supplied by the steam pressure to the pressure feed port 23, the check valve 24, the valve 25, and the condensate pressure feed pipe. The pressure is fed to a predetermined destination via the path 26.

When the condensate in the condensate pressure pump 4 is pumped and a float (not shown) is located at a predetermined lower part and the steam supply means and the steam condensing means are switched, the high-pressure steam inlet 28 is closed. On the other hand, when the cooling fluid supply port 29 is opened, the cooling fluid is supplied into the pump 4 from the cooling fluid supply pipe 17, and the remaining high-pressure steam in the pump 4 is condensed.

Since the vapor in the pump 4 is condensed and its volume is rapidly reduced, the pressure in the pump 4 is reduced to a pressure lower than the atmospheric pressure. When the pressure is reduced, the jacket 2
The condensate generated by the heating is quickly sucked into the pump 4 through the header tank 3.

At the initial stage of heating the reactor 1, since non-condensable air is retained in the jacket 2, the valves 14, 9 and 8 are opened and the valve 21 is closed.
When, for example, water is supplied from the replacement fluid supply pipe 15 to the header tank 3 and the jacket 2, the air in the tank 3 and the jacket 2 is pushed out by the fluid from the atmosphere communication pipe 7 and discharged to the outside.

When the initial air is discharged, the valves 8, 14
Is closed, the valves 9 and 21 are opened, and the fluid in the header tank 3 and the jacket 2 is discharged from the condensate pump 4 to the outside of the system.

When steam for heating is supplied to the jacket portion 2 from the valve 6 and the reactor 1 is initially heated, the condensate flows down into the condensate pump 4 via the header tank 3. When the condensed water accumulates in the pump 4 and the high-pressure steam inlet 28 is opened, the condensed water condensed by introducing the high-pressure steam into the pump 4 is pumped from the pressure feed port 23.

When the condensed water in the pump 4 is pumped, a float (not shown) is located at the lower portion, and is switched from the steam introduction port 28 to the cooling fluid supply port 29, so that the supply port 2
The cooling fluid is supplied from 9 into the pump 4, and the remaining steam is condensed and the volume thereof is rapidly reduced, so that the inside of the pump 4 is in a negative pressure state. When the inside of the pump 4 is in a negative pressure state, the condensed water in the jacket portion 2 quickly flows down into the pump 4 via the header tank 3.

[0028]

As described above, according to the present invention, the condensate generated in the heating section is retained by switching between the steam supply means and the steam condensing means according to the liquid level of the condensate in the condensate pump. Without heating, the entire heating section can be uniformly heated with steam, and the steam heating temperature can be accurately maintained at a predetermined value.

Further, according to the present invention, the non-condensable gas discharging means for discharging the non-condensable gas accumulated in the heating section to the outside of the system is attached, so that the heating temperature can be maintained more accurately.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reactor 2 Jacket part 3 Header tank 4 Condensate pressure feed pump 5 Steam supply pipe 12 Condensate inflow port 15 Substitution fluid supply pipe 17 Cooling fluid supply pipe 23 Condensate pressure feed port 28 High-pressure steam inlet 29 Cooling fluid supply port 31 Automatic valve 32 Steam ejector 37 Temperature sensor

Claims (1)

[Claims] 1. A condensate supply pump for supplying steam to a heating unit to heat an object to be heated, and for condensing water generated by heating to a predetermined location by a condensate pressure pump. A steam supply means for supplying steam and a steam condensing means for condensing the steam in the condensate pump are provided, and the steam supply means and the steam condensing means are switched according to the level of the condensate in the condensate pump. And a non-condensable gas discharging means for discharging non-condensable gas accumulated in the heating section to the outside of the system.