JP4540772B2 - 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 contained in a heat exchanger with heating steam, and more particularly to a steam heating apparatus suitable for a case where the heating temperature is a relatively low temperature of about 100 degrees C.
[0002]
[Prior art]
As a conventional steam heating device, for example, a device as disclosed in JP-A-9-250887 has been used. This is because a jacket portion 2 as a heating portion is formed in the reaction kettle 1 and a steam supply pipe 3 for heating is connected, and a condensate recovery device 16 for discharging condensate generated by heating from the heating portion is connected. A steam ejector 6 communicating with the steam supply pipe 3 is arranged on the inlet side of the heating section, the outlet side of the steam ejector 6 is connected to the jacket section 2, and the suction chamber 7 of the steam ejector 6 is connected to the condensate recovery device 16. The condensate is not retained in the jacket portion 2 and can be heated by a relatively low temperature steam of about 100 degrees C.
[0003]
[Problems to be solved by the invention]
In the said conventional thing, the temperature of the heating part fluctuated and there existed a problem which produced a heating nonuniformity in a to-be-heated material. This is because when the condensate recovery device communicates with the steam ejector, the condensate recovery is performed with a substantially constant suction force generated by the steam ejector regardless of the temperature or pressure state of the heating part or the temperature of the object to be heated. In order to suck the apparatus and further the connected heating part, the steam pressure of the heating part, that is, the steam temperature, cannot follow the temperature fluctuations of the heating part and the object to be heated, resulting in heating unevenness. .
[0004]
Accordingly, an object of the present invention is to obtain a steam heating apparatus that prevents the temperature fluctuation of the heating part and does not cause uneven heating temperature in the heated object by appropriately controlling the suction amount to the steam ejector. .
[0005]
[Means for Solving the Problems]
The means of the present invention devised to solve the above-mentioned problem is that a heating unit is formed in a heat exchanger, a heating steam supply pipe is connected, a steam ejector is attached to the steam supply pipe, and the steam ejector A condensate recovery device that discharges the condensate generated by heating from the heating section, and the condensate recovery device is connected to the suction chamber of the steam ejector and the exhaust port of the condensate recovery device. Connected to the lower part of the jacket portion and the condensate inlet of the condensate recovery device by a pipe line, and the check valve allows only passage of fluid from the jacket part to the condensate recovery apparatus side in the pipe line A condensate recovery pipe is connected to the condensate outlet via a check valve, and a pumping fluid inlet and a pumping fluid outlet are provided in the upper part of the condensate recovery device. It is connected to the high-pressure steam supply pipe through a road, and flows from the condensate water inlet When the condensate accumulates inside and the water level rises, the float inside the device rises and reaches a predetermined height, opening the pressure feed valve attached to the pressure feed fluid inlet and closing the exhaust valve attached to the exhaust port. As a result, high-pressure steam is supplied from the steam supply pipe into the condensate recovery device, so that the accumulated condensate is pumped from the condensate outlet to the condensate recovery pipe. When the internal float is lowered and lowered to a predetermined liquid level, the pressure feed valve at the pressure feed fluid inlet is closed and the exhaust valve attached to the exhaust port is opened to open the reaction kettle. In the case where condensate flows down from the jacket part into the condensate recovery unit, a control valve is disposed between the suction chamber of the steam ejector and the condensate recovery unit, and the pressure of the steam supplied from the steam supply pipe A steam pressure detection means to detect , According to the detection signal values from the steam pressure detecting means controls the opening and closing of the said control valve is for controlling the amount of suction to the steam ejector.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Normal steam saturated steam has a one-to-one relationship between pressure and temperature. Therefore, the steam temperature can be controlled simultaneously by controlling the steam pressure. The suction amount of the steam ejector can be controlled by controlling the opening and closing of the control valve on the suction chamber side of the steam ejector according to the supply steam pressure value, and the condensate recovery device and the heating unit communicating with the condensate recovery device Can be set to a predetermined pressure state, that is, a temperature state, and uneven heating temperature of the object to be heated can be prevented.
[0007]
【Example】
In this embodiment, an example in which the reaction kettle 1 is used as a heat exchanger will be shown. A jacket portion 2 as a heating portion is formed on the outer periphery of the reaction kettle 1 and a steam supply pipe 3 is connected thereto. The steam supply pipe 3 is connected with an on-off valve 4, a pressure control valve 5, and a steam ejector 6 in sequence. The steam ejector 6 is formed by a suction chamber 7 having a nozzle inside and a diffuser 9.
[0008]
A suction chamber 7 of the steam ejector 6 and an exhaust port 21 of a lower condensate recovery device 16 described later are connected by a pipe line 8. A control valve 10 is provided in the pipe line 8 and connected to a pressure sensor 11 as pressure detection means attached to the steam supply pipe 3.
[0009]
A pipe line 12 is connected to the lower part of the jacket part 2 and connected to the condensate inlet 15 of the condensate recovery device 16. A check valve 14 that allows only passage of fluid from the jacket portion 2 to the condensate recovery device 16 side is attached to the pipe line 12.
[0010]
A condensate recovery pipe 19 is connected to the condensate outlet 17 of the condensate recovery device 16 via a check valve 18. The check valve 18 allows passage of fluid from the condensate recovery device 16 only to the condensate recovery pipe 19 side.
[0011]
A pumping fluid inlet 20 and an exhaust port 21 are provided in the upper part of the condensate recovery device 16, and the pumping fluid inlet 20 is connected to the high-pressure steam supply pipe 3 through a pipe line 22.
[0012]
The condensate recovery device 16 is the same as that of the prior art, and when the condensate flowing in from the condensate inlet 15 accumulates inside and the water level rises, the float (not shown) rises, and when it reaches a predetermined height, the float snaps. It moves and opens the pressure feed valve attached to the pressure feed fluid inlet 20 and closes the exhaust valve attached to the exhaust port 21 so that the high-pressure steam from the steam supply pipe 3 enters the condensate recovery device 16. The condensate supplied and accumulated is pumped from the condensate outlet 17 to the condensate recovery pipe 19.
[0013]
As the condensate in the condensate recovery device 16 is pumped, the float inside (not shown) descends, and when it falls to a predetermined liquid level, the float snaps in the direction opposite to the above, and the pumping fluid flow The pressure feed valve at the inlet 20 is closed and the exhaust valve attached to the exhaust port 21 is opened, so that the condensate flows down from the jacket portion 2 of the reaction kettle 1 into the condensate recovery device 16. .
[0014]
When the exhaust valve of the exhaust port 21 is opened, the condensate recovery device 16 and the steam ejector 6 are communicated, and the condensate recovery device 16 is brought into a predetermined reduced pressure state by the suction force of the steam ejector 6.
[0015]
In FIG. 1, by supplying steam for heating from the steam supply pipe 3 to the jacket portion 2 of the reaction kettle 1, an object to be heated (not shown) in the reaction kettle 1 is heated. The heating steam temperature can be arbitrarily adjusted by adjusting the steam pressure by the pressure control valve 5, because the pressure and temperature of the steam, more precisely, the saturated steam has a one-to-one relationship. Steam deprived of heat by heating condenses into condensate.
[0016]
Condensate flows into the condensate recovery device 16 from the conduit 12 and the condensate inlet 15. In this case, the pumping valve of the pumping fluid inlet 20 is closed, but the exhaust valve of the exhaust port 21 is open and connected to the suction chamber 7 of the ejector 6. By bringing the condensate recovery device 16 into a predetermined pressure-reduced state by the suction force of the ejector 6, the condensate generated in the jacket portion 2 flows down into the condensate recovery device 16 without staying through the conduit 12. can do.
[0017]
In the present embodiment, the steam pressure sensor 11 is attached to the steam supply pipe 3 and the control valve 10 is controlled to open and close according to the detected pressure value, thereby maintaining the steam pressure, that is, the heating temperature of the jacket portion 2 with higher accuracy. Thus, the object to be heated in the reaction kettle 1 can be heated without heating unevenness.
[0018]
In the present embodiment, the example in which the suction chamber 7 of the steam ejector 6 is communicated with the exhaust port 21 of the condensate recovery device 16 is shown. However, the connection between the suction chamber 7 of the steam ejector 6 and the condensate recovery device 16 is as follows. For example, the condensate discharge device 16 may be connected to the suction chamber 7 by providing a connection port separate from the exhaust port 21 and the inflow port 20.
[0019]
【The invention's effect】
As described above, according to the present invention, by appropriately controlling the suction amount to the steam ejector according to the supply steam pressure value, the pressure fluctuation of the heating part, that is, the temperature fluctuation is prevented, and the heating temperature is applied to the object to be heated. A steam heating apparatus that does not cause unevenness can be obtained.
[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 Steam supply pipe 6 Steam ejector 7 Suction chamber 10 Control valve 11 Pressure sensor 15 Condensate inlet 16 Condensate recovery device 17 Condensate outlet 20 Pressure feed fluid inlet 21 Exhaust outlet

Claims (1)

A heating part is formed in the heat exchanger, a steam supply pipe for heating is connected, a steam ejector is attached to the steam supply pipe, and the suction chamber of the steam ejector and the condensate generated by heating are discharged from the heating part. The condensate recovery device is connected, and the condensate recovery device is connected by a pipe line to the suction chamber of the steam ejector and the exhaust port of the condensate recovery device. The inlet is connected by a pipe line, and a check valve that allows only passage of fluid from the jacket portion to the condensate recovery device side is attached to the pipe line, and the condensate outlet is connected via the check valve. water recovery pipe is connected, the upper part pumping fluid inlet and pumping fluid exhaust port is provided in the condensate recovery system is connected to a high-pressure steam supply pipe pumped fluid inlet via a conduit, condensate water inlet When the condensate flowing in from the inside accumulates and the water level rises, The float rises to a predetermined height and opens the pumping valve attached to the pumping fluid inlet and closes the exhaust valve attached to the exhaust port, so that high-pressure steam is condensed from the steam supply pipe. By supplying it to the inside of the recovery device, the condensate that has accumulated is pumped from the condensate outlet to the condensate recovery pipe. On the other hand, as the condensate is pumped, the internal float drops. When the liquid level drops to a predetermined level, the pumping valve at the pumping fluid inflow port is closed and the exhaust valve attached to the exhaust port is opened, so that the condensate flows into the condensate recovery unit from the jacket of the reaction kettle. In this case, a control valve is disposed between the suction chamber of the steam ejector and the condensate recovery device, and a steam pressure detecting means for detecting the pressure of the steam supplied from the steam supply pipe is attached to the steam pressure. According to the detection signal value from the detection means And it controls the opening and closing of the serial control valves, steam heating apparatus characterized by controlling the suction amount of the steam ejector.

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