JP2003126674A - Method for controlling temperature of high-temperature and high-pressure container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling a temperature of a high- temperature and high-pressure container in which the surface temperature of the container reaches a target temperature in a short time. SOLUTION: The method comprises steps of obtaining a temperature difference curve between the outer surface of the container (1) and the inside of the container (1) by conducting the temperature rising test of the pressure medium in the container (1) in advance to a predetermined temperature by a heating means (11) rolled around the outer peripheral of the high-pressure container, estimating the outer surface temperature of the container corresponding to the inner temperature of the container to set the target value and metering the outer surface temperature of the container momentarily and thus controlling the heating means (11) so that the measured value becomes equivalent to the target value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control method for raising the temperature inside a pressure vessel.

[0002]

2. Description of the Related Art FIG. 7 is a view showing the structure of a conventional high temperature and high pressure container. In FIG. 7, the pressure medium g is supplied to the pressure vessel 1.
An example of a high-temperature and high-pressure container in which high-temperature and high-pressure atmosphere is utilized by pressurizing and heating inside is shown.

In this high-temperature high-pressure container, the pressure medium g is fed from the supply pipe 7 through the supply hole 9 into the pressure chamber 1a formed by the body 2 and the upper lid 3a and the lower lid 3b to raise the pressure medium to a high pressure. Further, the pressure medium g is heated / heated through the body 2 by the heater 11 wound around the outer periphery of the body 2, and the object to be treated 15 in the pressure medium g is heated under isotropic pressure.

[0004]

As shown in FIG. 7, the conventional temperature control method of raising the temperature of the pressure medium g by the heater 11 is such that the cable 12c arranged so as to pass through the inside of the upper lid 3a and the lower lid 3b, Temperature sensors (such as thermocouples) 12a and 12b attached to the tip of 12d measure the temperature of the pressure medium g in the container 1, and the heater 11 is controlled based on the measured values.

FIG. 8 is a diagram showing changes in the inner surface temperature of the container and the outer surface temperature of the container by the above-mentioned conventional control method.
As shown in FIG. 8, in the above-described high-temperature high-pressure container, since the body 2 of the pressure container 1 is thick, there is a time difference between the change in the container outer surface temperature T _{i and} the change in the container inner surface temperature T _j . Therefore, the heater 11 tends to be heated or cooled,
On the contrary, when a temperature disturbance enters the container 1 (when the temperature of the supplied pressure medium g changes, etc.), the heater control shows a sensitive reaction, and the surface temperature of the container (pressure medium temperature).
There is a problem that it takes a lot of time to settle to the target value T ₀ .

It is an object of the present invention to provide a temperature control method for a high temperature and high pressure container in which the surface temperature of the target container reaches the target temperature in a short time.

Another object of the present invention is to provide a temperature control method for a high temperature and high pressure container which prevents a rapid rise in the outer surface temperature of the container immediately after the start of temperature rise.

[0008]

In order to solve the above problems and achieve the object, the temperature control method of the high temperature and high pressure container of the present invention is configured as follows.

(1) According to the temperature control method for a high temperature and high pressure container of the present invention, when the temperature of the pressure medium in the container is raised to a predetermined temperature by the heating means wound around the outer periphery of the pressure container, a temperature rising test is performed in advance. Perform a temperature difference curve between the outer surface of the container and the inside of the container, estimate the outer surface temperature of the container corresponding to the target inner temperature of the container from the temperature difference curve, and set it to a target value. The temperature is measured every moment, and the heating means is controlled so that the measured value becomes equal to the target value.

(2) The temperature control method for a high temperature and high pressure container according to the present invention is the method described in (1) above, and after coating the outer periphery of the pressure container around which the heating means is wound with a heat insulating material, The temperature rise is started and the temperature is controlled.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, since the thickness of a pressure vessel whose pressure inside the vessel exceeds 100 MPa is large, comparing the heat capacities of the pressure vessel and the pressure medium in the pressure vessel shows that the pressure vessel is much larger. ,and,
It is noted that the temperature inside the container is the same if the heat radiation conditions are the same for a certain temperature outside the container. In the present embodiment, a temperature rise test is performed in advance to obtain the temperature difference characteristic between the outer surface of the container and the pressure medium, the outer surface temperature of the container with respect to the target temperature of the pressure medium is estimated, and heater control is performed.

FIG. 1 is a diagram showing the structure and temperature control method of the high temperature and high pressure container according to the present embodiment. In FIG. 1, the same parts as those in FIG. 7 are designated by the same reference numerals. As shown in FIG. 1, the pressure vessel 1 has a structure in which the upper and lower ends of a thick body 2 are sealed by an upper lid 3a and a lower lid 3b, respectively, and a pressure chamber 1a is formed inside. The upper lid 3a and the lower lid 3b are supported from the outside by the yoke frames 5 and 5, respectively. Each of the upper lid 3a and the lower lid 3b is provided with an air vent hole 8 that connects the pressure chamber 1a and the air vent pipe 6, and a supply hole 9 that connects the pressure chamber 1a and the supply pipe 7, respectively.

Heaters 11 are wound and installed on the upper and lower portions of the outer periphery of the body 2, respectively, and the outer periphery (outer wall) of the body 2 is covered with the heat insulating material 12 on the outer side of the heater 11.
Is covered by. Temperature sensors (such as thermocouples) 22a and 22b are attached to the outer surfaces of the upper and lower portions of the body 2 around which the heater 11 is wound.

FIG. 2 is a diagram showing a block diagram of the temperature control system according to the present embodiment. In the present embodiment, the pressure vessel 1 accommodating the pressure medium g is heated from the outer periphery by the heater 11, and the temperature of the outer surface of the vessel at that time is measured by the temperature sensors 22a and 2a.
Measure with 2b. The control device 13 includes a temperature sensor 22a,
The heater 11 is controlled while comparing the measured value of 22b with the target value of the container outer surface temperature that has been input in advance.

As described above, in the present embodiment, the temperature rise test is performed in advance to obtain the temperature difference between the outer surface of the container and the pressure medium g under a predetermined temperature, and from this test result, the target pressure medium g The outer surface temperature of the container corresponding to the temperature is estimated, and heater control is performed.

FIG. 3 is a diagram showing a temperature gradient of the body 2 of the high temperature and high pressure container according to the present embodiment, and FIG. 4 is a diagram showing an example of a temperature difference characteristic curve obtained by a preliminary temperature rising test. In the preliminary temperature rising test, the pressure vessel 1 is installed under the same environmental conditions as in the actual case, and as shown in FIG. In this state, the container 11 is actually heated and heated by the heater 11, and the temperatures at the outer surface point a and the inner point d at that time are measured, and as shown in FIG. And the internal temperature difference characteristic curve N is obtained. Then, the container outer surface temperature corresponding to the target pressure medium temperature (target container internal temperature) is estimated from the temperature difference characteristic curve N, and the target value for heater control during actual operation is set.

FIG. 5 is a flowchart showing the procedure of temperature control according to the present embodiment. The temperature control method of the present embodiment will be described below with reference to FIG.

First, in step S1, a preliminary temperature rising test is performed under the same environmental conditions as in reality, and in step S2, the controller 13 heats the container 1 with the heater 11. Next, in step S3, the pressure medium temperature under each temperature is measured by the temperature sensor 1.
2a and 12b, and in step S4, the outer surface temperature of the container is measured by the temperature sensors 22a and 22b, and in step S5.
Then, the control device 13 creates the temperature difference characteristic curve N as shown in FIG. Next, in step S6, the control device 13
Estimates the container outer surface temperature corresponding to the target pressure medium temperature T ₀ from this temperature difference characteristic curve N and sets it to the target value T ₁ .

The operation of the high temperature and high pressure container is started in step S7, and the container 1 is heated by the heater 11 in step S8. In step S9, the temperature sensors 22a, 22
The measured value T _i of the outer surface temperature of the container is measured by b. In step S10, the control device 13 controls the temperature sensor 2
The measured values T _i of 2a and 22b are input, and the measured values T _i are compared with the target value of the external surface temperature of the container that has been input in advance.
_The heater 11 is controlled so that _i = T ₁ . If T _i = T ₁ in step S11, the series of temperature control ends, and if T _i = T ₁ is not satisfied, the processes in step S8 and subsequent steps are performed again.

FIG. 6 is a diagram showing a temperature control situation of the high temperature and high pressure container according to the present embodiment. As shown in FIG. 6, the container outer surface temperature T _i quickly reaches the target outer surface temperature T ₁ and stabilizes. Correspondingly, the pressure medium temperature (container inner surface temperature T _j ) also reaches the target in a short time. It can be seen that the temperature reaches T ₀ and stabilizes.

As described above, according to the temperature control method of the present invention, a temperature rise test is performed in advance to obtain a temperature difference curve between the outer surface of the container and the pressure medium, and from this temperature difference curve, the outside temperature corresponding to the target pressure medium temperature is obtained. Since the surface temperature is estimated and the target value is set and the heater is controlled, this is combined with the effect of the heat insulating material that coats the outer circumference of the container. There is no sudden rise in temperature, and the heater is turned on unnecessarily
The / OFF operation is also eliminated, the target temperature can be settled down in a short time in a stable state, and power consumption can be saved.
It also reacts gently to temperature disturbances inside the container,
This has the effect of allowing the target temperature to settle down.

The present invention is not limited to the above-mentioned embodiments, but can be carried out by appropriately modifying it within the scope of the invention.

[0023]

According to the temperature control method for a high temperature and high pressure container of the present invention, the surface temperature of the target container reaches the target temperature in a short time.

Further, according to the temperature control method for a high temperature and high pressure container of the present invention, it is possible to prevent a sudden increase in the outer surface temperature of the container immediately after the start of temperature rise.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of a high temperature and high pressure container and a temperature control method according to an embodiment of the present invention.

FIG. 2 is a diagram showing a block diagram of a temperature control system according to the embodiment of the present invention.

FIG. 3 is a diagram showing a temperature gradient of a body of the high temperature and high pressure container according to the embodiment of the present invention.

FIG. 4 is a diagram showing an example of a temperature difference characteristic curve obtained by a preliminary temperature rising test according to the embodiment of the present invention.

FIG. 5 is a flowchart showing a temperature control procedure according to the embodiment of the present invention.

FIG. 6 is a diagram showing a temperature control situation of the high temperature and high pressure container according to the embodiment of the present invention.

FIG. 7 is a view showing a structure of a high temperature and high pressure container according to a conventional example.

FIG. 8 is a diagram showing changes in the inner surface temperature of the container and the outer surface temperature of the container by a conventional control method.

[Explanation of symbols]

1 ... Pressure vessel 1a ... Pressure chamber 2 ... torso 3a ... Top lid 3b ... lower lid 5 ... Yoke frame 6 ... Air vent tube 7 ... Supply pipe 8 ... Air vent hole 9 ... Supply hole 11 ... Heater 12 ... Insulation 12a, 12b ... Temperature sensor 12c, 12d ... Cable 13 ... Control device 15 ... Object to be processed 22a, 22b ... Temperature sensor

Claims (2)

[Claims] 1. A temperature difference between the outer surface of the container and the inside of the container is preliminarily tested by raising the temperature of the pressure medium in the container by a heating means wound around the outer periphery of the container. Obtain a curve, estimate the container outer surface temperature corresponding to the target container inner temperature from the temperature difference curve and set it as a target value, measure the container outer surface temperature moment by moment, and the measured value is the target value. The method for controlling the temperature of a high temperature and high pressure container is characterized in that the heating means is controlled so as to be equal to. 2. The high temperature and high pressure container according to claim 1, wherein after the outer circumference of the pressure container around which the heating means is wound is covered with a heat insulating material, temperature increase is started to control the temperature. Temperature control method.