JPS59119189A - Method for heating object - Google Patents

Abstract

PURPOSE:To provide a method of heating an object wherein the quality of the object is prevented from being deteriorated even if the heat load of the object becomes to a set load or below. CONSTITUTION:If the heat load of the object to be heated becomes a set load, the flow rate of an intermediate heat medium fed to a heat transferring pipe 12 is throttled by a reaction temperature controller 70 and a flow rate control valve 60, and since the heat transferring pipe 12 has a surplus heat transferring area, the intermediate heat medium is discharged from the heat transferring pipe 12 at approximately the same temperature as that of the object. On the other hand, as the flow rate of the intermedite heat medium fed to the heat transferring pipe 12 is throttled, the heat medium is fed to the heat transferring pipe 20 in such an amount that exceeds the range of control of an intermediate heat medium temperature controller 71 and a flow rate control valve 61, and as a result the temperature of the intermediate heat medium at the outlet of a medium heater 21 deviates from the constant-value control and rises. The temperature of the intermediate heat medium passing through a conduit 50 actuates a temperature controller 72 and a three-way temperature controller 62, and since the intermediate heat medium whose temperature is lowered and that is to be returned from the tank 30 to a medium heater 21 by a pump 40 is allowed to by-pass the medium heater 21 and is mixed with the intermediate heat medium passing through the conduit 50, the temperature can be prevented from rising, and therefore the quality of the pbject to be heated can be prevented from being deteriorated.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for heating an object to be heated, and particularly a method for heating an object to be heated by an intermediate heat medium heated by a heat medium and flowing through a heat transfer tube. The present invention relates to a method of heating an object to be heated suitable for.

[Prior art]

In the conventional method of heating the object using an intermediate heat medium, if the object is directly heated with a high-temperature heat medium, the film temperature on the surface of the heat transfer tube on the side of the object to be heated will rise too much and the object to be heated will deteriorate. It is used in cases where the surface becomes a scum film during heat transfer and the heat transfer coefficient becomes extremely small.

However, as the heat load on the object to be heated decreases, the flow rate of the intermediate heat medium also decreases, and when the heat load on the object to be heated becomes less than the set load, the temperature at which the intermediate heat medium is supplied is set to 7.
The temperature is outside the 1 range of temperature control of the Ju heater and becomes close to the temperature of the heating medium at T'S temperature. In this way, when the temperature of the intermediate heat medium approaches the heat level of the heat medium, the heat source at the mouth of the drum will deteriorate.

[Objective of Invention 1] An object of the present invention is to provide a method for heating an object to be heated, which can prevent quality deterioration of the object even when the thermal load of the object is less than a set load. .

[Summary of the invention]

In the present invention, when the heat load of the object to be heated, which is heated by the heat medium and is heated by the intermediate heat medium flowing through the heat transfer + if, becomes equal to or less than the set load, the object is heated by the heat medium and is being supplied to the heat transfer tube. It is characterized in that the temperature of the intermediate heat medium supplied to the heat transfer tube is maintained constant by mixing the intermediate heat medium discharged from the heat transfer tube and whose temperature has decreased with the intermediate heat medium of 1. Even if the heat load of the hot object is less than the set load, the temperature of the intermediate heat medium supplied to the heat transfer tubes is prevented from rising, thereby preventing quality deterioration of the heated object. .

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to the drawings.

In the drawing, the device for heating the heated object includes a heater 13 in which a rotary machine 11 is rotated by a horse-moving device f'jlo, a heat exchanger tube 12 is installed inside, and a heat exchanger tube 20 is installed inside. It is composed of a medium heater 21, a tank 30 for temporarily storing an intermediate heat medium, and a pump 40 for circulating the intermediate heat medium.

The outlet of the medium heater 2] and the inlet of the heat transfer tube]2 are the dedicated pipe 5.
0, the outlet of the heat transfer 912 and the inlet of the tank 3o are connected by the ordinary pipe 51, the outlet of the tank; It is connected to the inlet through a dedicated pipe 53 in a closed cycle. Further, a conduit 54.5 is provided at the inlet and outlet of the heat exchanger tube 20.
5 are connected to each other.

The heat transfer tube 121111 of the dedicated pipe 5 () is provided with a danger control valve OQ, and the flow rate control valve 60 detects a 1ilW degree change in the heated object due to the thermal load of the heated object, and The valve opening degree of the flow rate control valve 60 is adjusted according to the temperature rise, and the heat exchanger tube 1
2. Controlling reaction temperature I
It is connected to the II/J device a70. A flow control j+4i1 is provided on the heat transfer side 20 of the dedicated tube 54, and the flow rate 'd, lJ starvation valve (1) sets the temperature of the intermediate heat medium at the outlet of the medium heater 21. The middle three (
It is connected to the medium temperature control equipment 71. The insulator pipe 53 is provided with a three-way M degree adjustment valve 62.
: ? iuj I hair rd? lH;+fl) A total of 72 are connected. Moreover, between the intermediate heat medium rest temperature detection point of the dedicated pipe 5o and the redundant control well 6o, there is a dedicated pipe 56 connected to a three-way temperature control valve 62 that bypasses the medium heater 2 and is connected to the redundant control well 6o.
connected. A temperature gauge 72 is connected to the joint connection point of the #28 pipe 56 with #old 50.

When the heat load of the object to be heated is higher than the set load, the flow rate of the intermediate heat medium supplied to the heat transfer tube 2 is adjusted according to the heat load of the object to be immediately heated. 60. At the same time, the temperature of the intermediate heat medium at the outlet of the medium heater 21 is controlled by the flow rate of the heat medium supplied to the heat transfer tubes 20 by the intermediate heat medium temperature Ifi control device 7] and the flow rate control valve 6]. Fixed value controlled. In addition, the heat exchanger tube 12
The intermediate heat medium discharged from the tank 30 is temporarily stored and then returned to the medium heater 2 by a pump.

When the heat load of the object to be heated becomes less than the set value, the flow rate of the intermediate heat medium supplied to the heat transfer tube 12 is controlled by the reaction temperature control device register 7 () and the flow rate control valve 6o, and the flow rate of the intermediate heat medium supplied to the heat transfer tube 12 is Since the heat transfer area of the heat transfer tube 12 is large enough, Ul- is emitted from the heat transfer tube 12 at a temperature comparable to the temperature of the object to be heated by 1 degree. On the other hand, the flow II of the intermediate heat medium supplied to the heat exchanger tube 12
Since t is narrowed down, intermediate heat medium temperature jW control @ J device i
'471, the heat transfer tube 2 exceeds the control range of the flow control valve 61.
As a result, the temperature of the intermediate heat medium at the outlet of the medium heater 21 increases beyond constant value control. Therefore, in this case, in order to keep constant the temperature of the intermediate heat medium supplied to the heat transfer tubes 12, the temperature of the intermediate heat medium passing through 50 tubes (1.4 degree controller 72, three-way /hIY degree adjustment box 62 is activated, and the ?=i1 stage in the hook 2 is returned to the four-body heater z1 by the pump 40 from the tank 3o.
The medium heater 2j is bypassed and mixed with the intermediate heat medium in 50 conduits (flow of 50 conduits) Jn L/.

In the 7JII heating method for the heated object as in this example, f+
, & When the negative Mj of the heated object becomes 6 Hd load 1, 1. Since you can prevent the rise, you can prevent the crystal 'i'i inferiority of the f41 heating nose.

[Efficacy of invention]

In the present invention, as explained above, the self-load of the brown '7!11 pigeon is more than the set T negative, and 7 + 1.1 points,
The intermediate heat medium that has been heated by the heat medium and is being passed through the heat transfer tubes of the heater is mixed with the intermediate heat medium whose temperature has decreased from the heat transfer tube of the heater to the heat transfer tube of the heater. Of the intermediate heat medium supplied to the heat tube? By keeping the AA degree constant, it is possible to prevent the temperature of the intermediate heat medium supplied to the heat transfer tube of the heater from rising even if the heat load of the object to be heated falls below the set load. Preventing quality deterioration of heated materials (J
It has the effect of being able to do two things.

[Brief explanation of drawings]

The drawing shows an example of a heated object heating device 7F in which the present invention is actually applied.
FIG.

Claims (1)

[Claims] 1. In the method of heating the object to be heated with an intermediate heat medium that is heated by a heat medium and flows through a heat transfer tube, 1) When the heat load of the object to be heated in 1S becomes below the set load, the heat medium The temperature of the intermediate heat medium supplied to the heat transfer tubes is maintained constant by mixing the intermediate heat medium that has been discharged from the heat transfer tubes and whose temperature has decreased with the intermediate heat medium that has been heated by the heat transfer tube and is being supplied to the heat transfer tubes. A method for heating an object to be heated, characterized by: