JP3341209B2 - Steam heating device - Google Patents

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 housed in a heat exchanger with steam for heating, and particularly suitable for a case where the heating temperature is relatively low, about 100.degree. The present invention relates to a steam heating device.

[0002]

2. Description of the Related Art As a conventional steam heating apparatus, for example, an apparatus disclosed in Japanese Patent Application Laid-Open No. 9-250887 has been used. This involves forming a jacket 2 as a heating section in the reaction vessel 1, connecting a steam supply pipe 3 for heating, connecting a condensate recovery device 16 for discharging condensate generated by heating from the heating section, and The steam ejector 6 communicating with the steam supply pipe 3 is arranged on the inlet side of the heating unit, the outlet side of the steam ejector 6 is connected to the jacket 2, and the suction chamber 7 of the steam ejector 6 is connected to the condensate recovery device 16. The condensate does not stay in the jacket 2
The object to be heated can be heated by relatively low temperature steam of about 00C.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
There has been a problem that the temperature of the heating unit fluctuates, causing uneven heating of the object to be heated. This is because when the condensate recovery device is in communication with the steam ejector, the condensate is collected with a substantially constant suction force generated by the steam ejector, regardless of the temperature or pressure of the heating section or the temperature of the object to be heated. Since the apparatus further sucks the connected heating section, the steam pressure of the heating section, that is, the steam temperature, cannot follow the temperature fluctuation of the heating section and the object to be heated, and uneven heating occurs. is there.

[0004] Accordingly, an object of the present invention is to provide a steam heating apparatus which prevents temperature fluctuations of a heating section by appropriately controlling the suction force of a steam ejector and which does not cause uneven heating of an object to be heated. is there.

[0005]

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. Connect a condensate recovery device that discharges water from the heating section,
In the condensate recovery device connected to the suction chamber of the steam ejector, a control valve is arranged on the inlet side of the steam ejector,
Attach steam pressure detecting means for detecting the pressure of steam supplied from the steam supply pipe to the heating section, and control the opening and closing of the control valve on the inlet side of the steam ejector in accordance with the detection signal value from the steam pressure detecting means. It controls the suction force of the ejector.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The relationship between pressure and temperature of a normal saturated steam for heating is determined on a one-to-one basis. Therefore, by controlling the steam pressure, the steam temperature can be controlled at the same time. By controlling the opening and closing of the control valve on the steam ejector inlet side according to the supply steam pressure value,
It can control the suction force of the steam ejector,
The condensate recovery device and the heating unit communicating with the condensate recovery device can be brought into a predetermined pressure state, that is, a steam temperature state, and temperature unevenness of the heated object can be prevented.

[0007]

EXAMPLE In this example, a reactor 1 was used as a heat exchanger.
Here is an example using. A jacket part 2 as a heating part is formed on the outer periphery of the reactor 1 and a steam supply pipe 3 is connected thereto. The on-off valve 4 and the pressure control valve 5 are connected to the steam supply pipe 3 in order. The steam supply pipe 3 is branched by a pipe 8 to connect the steam ejector 6. The steam ejector 6 is formed by a suction chamber 7 having a nozzle therein and a diffuser 9.

[0008] A control valve 10 is provided on the inlet side of the steam ejector 6 and is connected to a pressure sensor 11 as pressure detecting means attached to the steam supply pipe 3. Suction chamber 7 of steam ejector 6
Is communicated with the exhaust port 21 of the condensate recovery device 16.

A conduit 12 is connected to a lower portion of the jacket portion 2 and connected to a condensate inlet 15 of a condensate recovery device 16. The pipe 12 is provided with a check valve 14 that allows only fluid to pass from the jacket 2 to the condensate recovery device 16.

The condensate outlet 17 of the condensate recovery device 16
A condensate recovery pipe 19 is connected via a check valve 18. The check valve 18 allows the fluid to pass only from the condensate recovery device 16 to the condensate recovery pipe 19.

A pumping fluid inlet 20 and a pumping fluid exhaust port 21 are provided above the condensate recovery device 16, and the pumping fluid inlet 20 is connected to the steam supply pipe 3 via a pipe 22.

The condensate recovery device 16 is the same as that of the prior art. When the condensate flowing in from the condensate inlet 15 accumulates therein and its water level rises, the float (not shown) is raised, and when the water reaches a predetermined height. The float snaps,
The pressure-feeding valve attached to the pressure-feeding fluid inlet 20 is opened, and the exhaust valve attached to the exhaust port 21 is closed, so that high-pressure steam is supplied from the steam supply pipe 3 into the condensate recovery device 16. The condensed condensate is pumped from the condensate outlet 17 to the condensate recovery pipe 19.

As the condensate in the condensate recovery unit 16 is pumped, the float (not shown) descends and drops to a predetermined liquid level. The pressure feed valve of the inlet 20 is closed, and the exhaust valve attached to the exhaust port 21 is opened, and condensate flows down from the jacket 2 of the reactor 1 into the condensate recovery device 16. is there.

When the exhaust valve of the exhaust port 21 is opened, the condensate recovery device 16 and the steam ejector 6 communicate with each other, and the inside of the condensate recovery device 16 is brought into a predetermined reduced pressure state by the suction force of the steam ejector 6. It is.

In FIG. 1, a reaction vessel 1 is connected to a steam supply pipe 3.
By supplying steam for heating to the jacket portion 2 of the above, an object to be heated (not shown) in the reaction vessel 1 is heated. The temperature and the temperature of the heated steam can be arbitrarily adjusted by adjusting the steam pressure by the pressure control valve 5 because the pressure and the temperature of the steam, more precisely, the saturated steam, have a one-to-one relationship. The steam deprived of heat by heating condenses and becomes condensed water.

The condensate flows into the condensate recovery device 16 from the conduit 12 and the condensate inlet 15. In this case, the pumping valve at the pumping fluid inlet 20 is closed, but the exhaust valve at the exhaust port 21 is open and connected to the suction chamber 7 of the ejector 6. By setting the inside of the condensate recovery device 16 to a predetermined reduced pressure 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 stagnation via the pipeline 12. can do.

The suction force generated by the ejector 6 can be arbitrarily controlled within a predetermined range by controlling the pressure and amount of steam passing through the ejector 6 with the control valve 10. In the present embodiment, a steam pressure sensor 11 is attached to the steam supply pipe 3, and the control valve 1 is controlled in accordance with the detected pressure value.
By controlling the opening / closing of 0, the steam pressure of the jacket portion 2, that is, the heating temperature can be more accurately maintained, and the object to be heated in the reaction vessel 1 can be heated without uneven heating.

In the case of performing steam heating, if non-condensable gas such as air is mixed in the steam, the heat transfer efficiency is extremely reduced. Also, in the initial stage of starting heating, a large amount of air generally remains in the heating device. In such a case, by allowing steam to pass through the steam ejector 6, the air remaining in the condensate recovery device 16 and the jacket portion 2 can be sucked and removed to the outside of the system. In the heat transfer efficiency can be prevented.

In this embodiment, an example is shown in which the suction chamber 7 of the steam ejector 6 is communicated with the exhaust port 21 of the condensate recovery device 16, but the suction chamber 7 of the steam ejector 6 and the condensate recovery device 1 are connected.
The connection with the suction chamber 7 is not limited to this. For example, a connection port separate from the exhaust port 21 and the inflow port 20 may be provided in the condensate discharge device 16 and connected to the suction chamber 7.

[0020]

As described above, according to the present invention, by appropriately controlling the suction force of the steam ejector in accordance with the supplied steam pressure value, it is possible to prevent pressure fluctuations, that is, temperature fluctuations in the heating section, and It is possible to provide a steam heating device that does not cause uneven heating temperature in the object.

[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 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 fluid inlet 21 Exhaust port

Claims (1)

(57) [Claims] 1. A heating section is formed in a heat exchanger, a steam supply pipe for heating is connected, a condensate recovery device for discharging condensate generated by heating from the heating section is connected, and the condensate recovery is performed. In the device connected to the suction chamber of the steam ejector,
A control valve is arranged on the inlet side of the steam ejector, and steam pressure detecting means for detecting a pressure of steam supplied from the steam supply pipe to the heating unit is attached.The steam is supplied in accordance with a detection signal value from the steam pressure detecting means. A steam heating device characterized by controlling opening and closing of a control valve on an ejector inlet side to control a suction force of a steam ejector.