JP5047426B2 - 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 with steam, and more particularly to a steam heating apparatus suitable for heating at a relatively low temperature of about 100 ° C. Specifically, it is used for steam heating of various reaction kettles used for polymerization reactions and the like, food distillers, concentrators, and sterilizers. The object to be heated in these cases often causes thermal damage due to a slight temperature change, and it is necessary to maintain the heating temperature with high accuracy.
[0002]
[Prior art]
A conventional steam heating apparatus is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-328422. This is a heating steam supply pipe connected to the heating section, a condensate recovery device that discharges the condensate generated by heating, and a replacement fluid supply pipe that replaces the air in the heating section. The steam can be heated at a low temperature of 100 ° C. or lower by eliminating the air in the heating section with a replacement fluid and reducing the pressure.
[0003]
[Problems to be solved by the invention]
In the above conventional one, since the condensate generated in the heating unit flows into the condensate recovery device by natural flow based on the inflow head, the condensate in the heating unit is reduced when the amount of condensate generated increases. There was a problem that the entire heating unit could not be uniformly heated by steam because the heating unit could not be quickly discharged without stagnation and part of the heating unit was covered with condensate.
[0004]
Therefore, the subject of this invention is obtaining the steam heating apparatus which can maintain steam heating temperature to a predetermined value accurately, without making the condensate which generate | occur | produced in the heating part stay.
[0005]
[Means for Solving the Problems]
The means of the present invention taken to solve the above problems is to supply steam to the heating unit to steam-heat the object to be heated, and connect a condensate pump to the heating unit via a header tank, Condensate generated by heating is pumped to a predetermined location by a condensate pump, and the condensate pump is provided with a high-pressure steam inlet and a cooling fluid supply port, and the condensate pump is connected to the high-pressure steam inlet. A float supplying means for supplying steam for pressure feeding is connected, and a steam condensing means for condensing steam in the condensate pump is connected to the cooling fluid supply port, and a float arranged inside the condensate pump is When the condensate liquid level rises, the high pressure steam inlet is opened and the high pressure steam flows into the pump, while the cooling fluid supply port is closed and the condensate inside the pump is closed. Pumping port by steam pressure The condensate pump in the condensate pump is pumped and the internal float is located at a predetermined lower portion so that the steam supply means and the steam condensing means are switched, thereby providing a high-pressure steam inlet. When the cooling fluid supply port is opened, cooling fluid is supplied into the pump, the remaining high-pressure steam in the pump is condensed, and the volume of steam in the pump is drastically reduced. When the pressure inside the pump is reduced to a pressure lower than atmospheric pressure, the condensate generated by heating in the heating section is sucked into the pump, and the steam supply pipe for supplying steam to the heating section is automatically connected to a pipe branching out. A steam ejector, connect the suction chamber of the steam ejector to the header tank, attach a temperature sensor to the header tank to detect the internal temperature, and use the temperature sensor, automatic valve, and steam ejector. It constitutes the condensed gas outlet means, by the noncondensable gas discharging means is for discharging the noncondensable gas accumulated in the heating section to the outside of the system.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
When the condensate generated in the heating section reaches the condensate pressure pump and reaches a predetermined liquid level, the steam supply means and the steam condensing means are switched, and high-pressure steam for pressure feed is fed from the steam supply means into the condensate pressure feed pump. Supplied and condensate is pumped to a predetermined location. When the condensate is pumped to a predetermined low liquid level, the steam supply means is switched to the steam condensing means, and the steam remaining in the condensate pump is condensed and its volume is rapidly reduced. The pump is in a negative pressure state below atmospheric pressure. Thus, the condensate pumping pump is brought into a negative pressure state, so that the condensate generated in the heating unit quickly flows down to the condensate pumping pump due to the pressure difference and does not stay in the heating unit.
[0007]
Any vapor condensing means may be used as long as it can condense the vapor in the condensate pump, and the vapor and cooling fluid may be brought into direct contact with each other to condense, or indirectly condensed through heat exchange. Can be used.
[0008]
By attaching the non-condensable gas discharge means to the heating unit, the inside of the heating unit becomes negative pressure, and flows into the heating unit by mixing with non-condensable gas such as air flowing in from the outside, or supplied steam. The non-condensable gas is discharged to the outside by the non-condensable gas discharging means.
[0009]
The uncondensed gas discharge means, and by accumulation of air or the like temperature decreases kite to the heating portion, is detected by a temperature sensor can be used such as those discharged by driving the vacuum pump.
[0010]
【Example】
In a present Example, the example of the jacket part 2 of the reaction kettle 1 is shown as a heating part. In FIG. 1, a steam heating apparatus is configured by connecting a condensate pressure pump 4 to a jacket portion 2 via a header tank 3.
[0011]
A steam supply pipe 5 for supplying steam for heating to the jacket portion 2 is connected via a valve 6. Steam with a predetermined pressure or temperature is supplied from the valve 6 to the jacket part 2 to heat the object to be heated in the reaction kettle 1 (not shown).
[0012]
An atmosphere communication pipe 7 is attached to the upper part of the jacket part 2 via a valve 8. A header tank 3 is connected to the lower portion of the jacket portion 2 via a valve 9. The header tank 3 is a tank for temporarily storing the condensate generated in the jacket portion 2.
[0013]
An automatic valve 31 and a steam ejector 32 are arranged in a pipe line 30 branched from the steam supply pipe 5. The steam ejector 32 includes a suction chamber 33 having a nozzle (not shown) and a diffuser 34 inside. The suction chamber 33 is connected to the upper portion of the header tank 3 through a pipe line 35 and a check valve 36. 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).
[0014]
When non-condensable gas such as air accumulates in the header tank 3, the temperature sensor 37 detects a decrease in the temperature, opens the automatic valve 31, and supplies steam to the steam ejector 32, thereby causing non-condensable gas in the tank 3. Condensed gas is sucked and removed to the outside.
[0015]
In this embodiment, the automatic valve 31, the steam ejector 32, and the temperature sensor 37 constitute a non-condensable gas discharge means .
[0016]
The lower part of the header tank 3 is connected to the condensate inlet 12 of the condensate pressure pump 4 by a pipe 11. A replacement fluid supply pipe 15 is connected to the lower side portion of the tank 3 through a valve 14.
[0017]
A valve 21 and a check valve 22 are attached to the pipe 11. The check valve 22 allows passage of fluid only from the header tank 3 in the direction of the condensate pressure pump 4, and does not allow passage of fluid in the reverse direction. The valve 21 is for adjusting the amount of condensate flowing down to the condensate pressure-feed pump 4.
[0018]
A condensate pressure feed line 26 is also connected to the 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 fluid to pass only in the outward direction from the condensate pump 4 to the condensate pump line 26 side.
[0019]
A high-pressure steam inlet 28 connected to a steam pipe 27 branched from the steam supply pipe 5 is provided above the condensate pressure pump 4. A cooling fluid supply port 29 is provided on the side of the high-pressure steam inlet 28. A cooling fluid supply pipe 17 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 a steam supply means, and the cooling fluid supply pipe 17 and the cooling fluid supply port 29 constitute a steam condensing means.
[0020]
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 inside of the pump 4 can be brought into the same pressure state as the inside of the header tank 3.
[0021]
The condensate pump 4 is configured such that when a float (not shown) disposed therein is positioned at an upper portion due to the rise in the condensate liquid level, the high-pressure steam inlet 28 is opened and high-pressure steam is pumped from the steam pipe 27. On the other hand, since the cooling fluid supply port 29 is closed, the condensate inside the pump 4 is fed into the pressure feed port 23, the check valve 24, the valve 25 and the condensate pressure feed line 26 by the pressure of steam. Then, it is pumped to a predetermined pumping destination.
[0022]
When the condensate in the condensate pump 4 is pumped and a float (not shown) is positioned at a predetermined lower portion and the steam supply means and the steam condensing means are switched, the high-pressure steam inlet 28 is closed, while the cooling is performed. By opening the fluid supply port 29, the cooling fluid is supplied from the cooling fluid supply pipe 17 into the pump 4, and the remaining high-pressure steam in the pump 4 is condensed.
[0023]
Since the vapor | steam in the pump 4 condenses and the volume reduces rapidly, the inside of the pump 4 will be in the pressure reduction state below atmospheric pressure. Due to the reduced pressure state, the condensate generated by heating in the jacket portion 2 is quickly sucked into the pump 4 through the header tank 3.
[0024]
In the initial stage of heating the reaction kettle 1, since non-condensable air remains in the jacket portion 2, the valves 14, 9 and 8 are opened, the valve 21 is closed, and the replacement fluid is supplied. When, for example, water is supplied from the pipe 15 to the header tank 3 and the jacket part 2, the air in the tank 3 and the jacket part 2 is pushed out by the fluid from the atmosphere communication pipe 7 and discharged to the outside.
[0025]
When the initial air is discharged, the valves 8 and 14 are closed, the valves 9 and 21 are opened, and the fluid in the header tank 3 and the jacket portion 2 is discharged from the condensate pump 4 to the outside of the system.
[0026]
When steam for heating is supplied from the valve 6 to the jacket portion 2 to initially heat the reaction kettle 1, the condensate flows down into the condensate pressure pump 4 through the header tank 3. When condensate accumulates in the pump 4 and the high-pressure steam inlet 28 opens, the condensate accumulated by introducing high-pressure steam into the pump 4 is pumped from the pumping port 23.
[0027]
When the condensate in the pump 4 is pumped, a float (not shown) is positioned at the lower part, and the cooling fluid is supplied from the supply port 29 into the pump 4 by switching from the steam inlet 28 to the cooling fluid supply port 29. The remaining steam is condensed and the volume of the steam is rapidly reduced, so that the pump 4 is in a negative pressure state. When the inside of the pump 4 is in a negative pressure state, the condensate in the jacket portion 2 immediately flows down into the pump 4 via the header tank 3.
[0028]
【Effect of the invention】
As described above, according to the present invention, by switching between the steam supply means and the steam condensing means according to the condensate liquid level in the condensate pressure pump, the condensate generated in the heating unit is not retained, The entire heating unit can be uniformly heated with steam, and the steam heating temperature can be maintained at a predetermined value with high accuracy.
[0029]
According to the present invention, the non-condensable gas discharging means for discharging the non-condensable gas accumulated in the heating unit to the outside of the system is attached, so that the heating temperature can be maintained with higher accuracy.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a steam heating apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reaction kettle 2 Jacket part 3 Header tank 4 Condensate pressure feed pump 5 Steam supply pipe 12 Condensate inlet 15 Replacement fluid supply pipe 17 Cooling fluid supply pipe 23 Condensate pressure feed port 28 High pressure steam inlet 29 Cooling fluid supply 31 Automatic valve 32 Steam ejector 37 Temperature sensor

Claims (1)

Steam is supplied to the heating unit to steam-heat the object to be heated, and a condensate pump is connected to the heating unit via a header tank, and the condensate generated by heating is pumped to a predetermined location by the condensate pump. The condensate pump is provided with a high-pressure steam inlet and a cooling fluid supply port, and a steam supply means for supplying steam for pumping to the condensate pump is connected to the high-pressure steam inlet. When the steam condensing means for condensing the steam in the condensate pressure pump is connected to the fluid supply port, and the float arranged inside the condensate pressure pump is located at the upper part due to the rise of the condensate liquid level, The high-pressure steam inlet is opened and high-pressure steam flows into the pump, while the cooling fluid supply port is closed, and the condensate inside the pump is pumped from the pumping port to a predetermined pumping destination by the steam pressure. Condensate in water pump By pumping and switching the steam supply means and the steam condensation means when the internal float is located at a predetermined lower part, the high-pressure steam inlet is closed, while the cooling fluid supply opening is opened. The cooling fluid is supplied inside, the remaining high-pressure steam in the pump is condensed, the volume of the steam in the pump decreases rapidly, and the pump is depressurized to below atmospheric pressure. The condensate generated by the pump is sucked into the pump, and an automatic valve and a steam ejector are placed in a pipe branching the steam supply pipe that supplies steam to the heating unit, and the suction chamber of the steam ejector is connected to the header tank. A temperature sensor for detecting the internal temperature is attached to the header tank, and the temperature sensor, the automatic valve, and the steam ejector constitute non-condensable gas discharge means. Accordingly, steam heating device comprising a Turkey to discharge the noncondensable gas accumulated in the heating section to the outside of the system.

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