JPH0934558A - Steam heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam heating device which can keep the heating temperature at a fixed level despite the change in the quantity and the temperature of an object to be heated. SOLUTION: A jacket part 2 is provided at the outer circumference of a reaction oven 1, and a pressure sensor 7 is attached at the upper part of the part 2. A heat carrier stay part 3 is prepared at the lower part of the part 2, and a heat carrier 4 is enclosed into the part 3. Then a burner 9 is attached at the lower part of the part 3, and a fuel supply pipe 11 is connected to the burner 9 via a flow rate control valve 12. Then the valve 12 is connected to the sensor 7 via a controller 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam heating device for heating an object to be heated by heating steam. Specifically, there are a reaction pot for performing various chemical reactions, a heating device for food, a sterilizer for medical products, and the like.

[0002]

2. Description of the Related Art As a conventional steam heating device, for example, one disclosed in Japanese Patent Application Laid-Open No. 4-290556 has been used. This is because a liquid reservoir is provided in the lower part of the jacket of the reaction kettle, a heat medium is enclosed in the liquid reservoir, and the heat medium is heated by an appropriate heating means to generate heated steam, which is then passed through the jacket. The reactor is steam heated.

[0003]

The above-mentioned conventional heating device has a problem that the heating temperature cannot be kept constant. In particular, when the temperature or amount of the object to be heated changes greatly, the heating temperature also changes significantly. This is because the jacket part as the heating chamber is kept in a predetermined pressure state and the heating medium is heated by the generated heating steam, so that the temperature of the object to be heated decreases or the amount increases, This is because the condensation of the heated steam increases and the steam pressure in the heating chamber drops sharply, and the heating temperature also drops.

Therefore, a technical object of the present invention is to obtain a steam heating apparatus capable of maintaining a constant steam heating temperature regardless of changes in the temperature or quantity of the object to be heated.

[0005]

The structure of the steam heating apparatus according to the present invention is as follows. A heat exchanger comprising a heat exchanger having a heating chamber, a heat medium reservoir connected to the heating chamber, and heating means for heating the heat medium in the heat medium reservoir to generate heated steam. A pressure detecting means for detecting the pressure is attached, and a heating amount control section for controlling the heating heat amount of the heating means according to the detection signal from the pressure detecting means is provided.

[0006]

The heating chamber is filled with the heating steam by heating the heat medium by the heating means to vaporize the heat medium to heat the heat exchanger. In this case, the steam pressure in the heating chamber is detected by the pressure detecting means, and the amount of heat of heating is controlled according to the detected pressure value, so that even if the amount of the heated object increases and the heating steam pressure sharply decreases. By detecting the pressure drop by the pressure detection means and rapidly increasing the heating heat quantity, the heating steam pressure, that is, the heating steam temperature can be maintained constant.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated embodiment will be described in detail. In this embodiment, an example in which the reaction kettle 1 is used as the heat exchanger is shown. A jacket portion 2 as a heating chamber formed on the outer periphery of the reaction kettle 1.
A pressure sensor 7 as a pressure detecting means attached to the jacket 2, a heat medium reservoir 3 connected to the lower portion of the jacket 2, and a heating means 5 for heating the heat medium 4 of the heat medium reservoir 3. And a heating amount control unit 6 that controls the amount of heating heat of the heating means 5 constitute a steam heating device.

A pressure sensor 7 for detecting the internal pressure is attached to the upper portion of the jacket 2. The heat medium reservoir 3 connected to the lower portion of the jacket 2 communicates with the jacket 2 through a passage 8 and stores the heat medium 4 such as water or dowsam therein. Air inside the jacket 2 is almost completely removed in advance.

A plurality of burners 9 as heating means 5 are arranged below the heat medium reservoir 3 via a case 10. Bar
A fuel supply pipe 11 for supplying fuel is connected to the nozzle 9 through a flow rate control valve 12. The flow rate control valve 12 is connected to the pressure sensor 7 via the controller 13. Flow control valve 1
The heating amount control unit 6 is constituted by 2 and the controller 13.
In this embodiment, an example in which only one flow rate adjusting valve 12 is attached has been shown, but the flow rate adjusting valve may be attached to each of the plurality of burners 9 to adjust the fuel individually.

Next, the operation will be described. When heating the reaction kettle 1, the flow rate control valve 12 is opened to supply fuel to the burner 9 to heat and evaporate the heat medium 4. The vaporized heat medium 4 reaches the jacket 2 from the passage 8 and heats the reaction kettle 1,
The object to be heated in the reaction kettle 1 (not shown) is heated. Reactor 1
The condensed liquid of the vapor condensed by heating is dripped from the lower part of the jacket part 2 into the heat medium reservoir part 3 and heated again.

There is a correspondence relationship between the heating steam pressure in the jacket portion 2 and the temperature, and the heating steam temperature can be controlled by adjusting the steam pressure. When the temperature of the object to be heated in the reaction kettle 1 decreases or the amount of the object to be heated increases, the steam pressure in the jacket portion 2 advances and the steam pressure temporarily decreases, but the decrease is detected by the pressure sensor 7. By expanding the opening of the flow rate control valve 12 through the controller 13 to increase the fuel supply amount, the evaporation amount of the heat medium 4 can be increased to recover the steam pressure, that is, the steam temperature. The heating temperature in the jacket part 2 can be maintained substantially constant.

In this embodiment, the reactor 1 is used as the heat exchanger, but it may be used as a heat exchanger for other heating devices and sterilizers. Further, in the present embodiment, the example in which the heating steam and the condensate communicate with each other through the passage 8 is shown, but the heating steam is supplied from one passage and condensed from the other passage by providing a plurality of passages. It is also possible to circulate the liquid so that it drops.

[0013]

According to the present invention, even if the temperature or amount of the object to be heated fluctuates and the heating steam pressure changes, the pressure is detected by the pressure detecting means to control the amount of heat for heating. A change, that is, a change in steam temperature can be promptly corrected, and a steam heating apparatus capable of maintaining a constant heating temperature can be obtained.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional configuration diagram of an embodiment of a steam heating device of the present invention.

[Explanation of symbols]

 1 Reactor 2 Jacket 3 Heat medium reservoir 4 Heat medium 7 Pressure sensor 9 Burner 11 Fuel supply pipe 12 Flow rate control valve 13 Controller

Claims (1)

[Claims] 1. A heat exchanger having a heating chamber, a heating medium reservoir connected to the heating chamber, and heating means for heating a heating medium in the heating medium reservoir to generate heating steam. ,
Attach pressure detection means to detect the steam pressure in the heating chamber,
A steam heating device comprising a heating amount control unit for controlling the heating heat amount of the heating unit according to a detection signal from the pressure detecting unit.