JP2000000460A - Steam heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a steam heater by which material to be heated can be effectively heated even when drainage is retained in a heating chamber. SOLUTION: On the outer periphery of a reaction kettle l, a jacket part 2 is provided. A feed inner pipe 6 is fitted in the jacket part 2 and is connected to a steam feed pipe 3. A lower end opening 7 of the feed inner pipe 6 is opened to a lower region of retained drainage 8. By steam fed from the lower end opening 7, the retained drainage 8 foams and flows, thereby improving heating efficiency to the reaction kettle 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam heating apparatus for heating an object to be heated by heating steam. Specifically, it is a steam heating device used as a reactor for performing various chemical reactions, a heating device for food, or a sterilizing device for medical products.

[0002]

2. Description of the Related Art As a conventional steam heating apparatus, for example, in a reaction vessel, heating steam is supplied to a jacket portion provided on the outer periphery of the reaction vessel to heat an object to be heated in the reaction vessel with the calorific value of the steam. That was generally done.

[0003]

In the above-mentioned conventional heating device, low-temperature drain having a low temperature stays at the bottom of the jacket portion, and the low-temperature drain staying portion cannot perform steam heating, so that the object to be heated cannot be heated. There was a problem that the whole could not be efficiently heated with steam. In particular, when heating by supplying relatively low-pressure steam at 100 ° C., that is, about the atmospheric pressure, the difference between the atmospheric pressure and the supplied steam pressure is small. Therefore, it is difficult to remove the low-temperature drain to the outside, and a large amount of low-temperature drain stays at the bottom of the jacket portion.

Further, when the temperature of the object to be heated is lowered or the amount is increased, the heating steam is rapidly condensed while the steam supply amount is still small, and the steam pressure in the jacket portion is suddenly reduced, and the steam is greatly increased. As a result, a vacuum state lower than the atmospheric pressure occurs, so that the drain cannot be removed out of the system, and the drain stays.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a steam heating apparatus capable of heating an object to be heated at a temperature closer to the steam temperature even if low-temperature drain stays, thereby improving heating efficiency. Is to get.

[0006]

Means for solving the above-mentioned problems according to the present invention include a heat exchanger having a heating chamber, a steam supply means for supplying heating steam to the heating chamber, and a heating chamber. In the apparatus provided with a drain discharge means for discharging the drain condensed by heat exchange in the heating chamber, an end of the steam supply means on the heating chamber side is opened inside the stagnant drain of the heating chamber.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
By opening the inside of the stagnant drain of the heating chamber, the steam supplied to the heating chamber is once supplied to the heating chamber after passing through the inside of the stagnant drain. As the steam passes through the inside of the stagnant drain, the drain undulates and flows with the flow of the steam.

When the drain is wavy, a part of the wall of the heating chamber that has been in contact with the drain can come into contact with the steam. The heat transfer rate to the heat exchanger thus increased increases, and the heating efficiency can be improved.

When the drain flows with the flow of the steam, the heat transfer coefficient from the drain to the heat exchanger and the film heat transfer coefficient are compared with the case where the drain is stationary.
Increases, the heat transmission rate to the heat exchanger also increases, and the heating efficiency can be improved.

In addition, when the steam passes through the inside of the drain, and particularly when the steam passes through a portion having a low drain temperature at the bottom of the retained drain, the drain temperature increases.
Similarly, the heating efficiency can be improved.

[0011]

EXAMPLE In this example, a reactor 1 was used as a heat exchanger.
Here is an example using. A jacket section 2 as a heating chamber formed substantially all around the reaction vessel 1, a steam supply pipe 3 for supplying steam for heating to the jacket section 2, a steam temperature control valve 4 attached to the steam supply pipe 3, and And a drain discharge pipe 5 for discharging the drain of the condensed water of the steam generated in the jacket portion 2 to the outside of the system, to constitute a steam heating device.

The steam supply pipe 3 is connected to the supply inner pipe 6 in the jacket 2, and opens a lower end opening 7 of the supply inner pipe 6 in a region below the stagnation drain 8. In this embodiment, the lower end opening 7 is opened in the horizontal direction at the bottom of the jacket portion 2 to cause the drain 8 to undulate and to flow the drain 8 in the horizontal direction. Jacket section 2 with steam supply pipe 3 and supply inner pipe 6
Constituting steam supply means for supplying steam to the fuel cell.

At the center of the reaction vessel 1, a temperature sensor 9 for detecting the temperature of a heated object (not shown) in the vessel 1 is attached.
It communicates with the temperature control valve 4 via the temperature controller 10. The temperature control valve 4 controls the amount of steam supplied to the jacket 2 according to the temperature of the object to be heated.

A steam trap 11 is attached to a drain discharge pipe 5 connected to a lower portion of the jacket portion 2. The steam trap 11 discharges only the drain flowing down from the jacket portion 2 from the outlet to the outside, and does not discharge steam. The drain discharge pipe 5 and the steam trap 11 constitute drain discharge means.

The steam supplied from the steam supply pipe 3 and the supply inner pipe 6 to the jacket portion 2 is deprived of heat by the reaction vessel 1 and an object to be heated therein and condensed to form a drain, which is formed at the bottom of the jacket portion 2. Accumulate. In this case, when the steam pressure in the jacket portion 2 is sufficiently higher than the pressure on the outlet side of the steam trap 11, that is, when the differential pressure is sufficient, the drain in the jacket portion 2 is quickly discharged from the steam trap 11 to the outside. However, when the differential pressure is small or almost nonexistent, or when the pressure in the jacket portion 2 is lower than the pressure on the outlet side of the steam trap 11, the drain is not discharged from the steam trap 11 and the jacket portion is not discharged. 2 Stay at the bottom.

In the present embodiment, the heating steam is supplied from the lower region of the drain 8 staying at the bottom of the jacket portion 2 through the opening 7 so that the drain 8 undulates and rotates in the horizontal direction. The heating efficiency is improved by flowing, increasing the contact area between the reaction vessel 1 and the heating steam and increasing the amount of heat transfer from the fluid drain to the reaction vessel 1.

In this embodiment, an example is shown in which the reactor 1 is used as a heat exchanger, but it can also be used as a heat exchanger for other heating devices, sterilizers and the like. Further, in this embodiment, an example in which only one supply inner pipe 6 is used is shown, but a plurality of supply inner pipes may be provided.

[0018]

According to the present invention, even if the drain stays in the heating chamber, by supplying the steam for heating by passing through the inside of the stay drain, the drain is made to undulate and flow. Heating efficiency can be improved by increasing the contact area of the steam and increasing the heat transfer coefficient from the drain to the heat exchanger.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reaction pot 2 Jacket part 3 Steam supply pipe 5 Drain discharge pipe 6 Supply inner pipe 7 Lower end opening 11 Steam trap

Claims (1)

[Claims] 1. A heat exchanger having a heating chamber, a steam supply means for supplying heating steam to the heating chamber, and a drain discharging means for discharging the drain condensed by heat exchange in the heating chamber to the outside of the system. In the thing, the heating chamber side end of the steam supply means,
A steam heating device, wherein the steam heating device is opened inside a stagnant drain of a heating chamber.