JPH0985004A - Concentrating and distilling apparatus provided with liquid surface controlling mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concentrating and distilling apparatus provided with a liquid surface controlling mechanism by which the liquid level in a can is stably detected and abnormality of the liquid surface is reliably detected. SOLUTION: In a concentrating and distilling apparatus to evaporate a liquid in an evaporation can 1 by heating 2 from the inside or outside while detecting the liquid surface in the can 1 and continuously controlling the surface, a temperature sensor 3 is attached to the inside or the outside of the evaporation can 1 and a liquid surface controlling mechanism 4 to detect the liquid surface in the can based on the displacement of the detected value of the temperature sensor is installed. The liquid surface controlling mechanism 4 has a mechanism to detect the decrease LL of the liquid level in the can and prevent heating in empty state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentration / distillation apparatus, and more particularly to a concentration / distillation apparatus equipped with a novel liquid level control mechanism for an evaporator.
It relates to a distillation apparatus.

[0002]

2. Description of the Related Art Conventionally, in an evaporation can of a concentration / distillation device, in order to prevent damage from overheating of a heating source of a container,
The heating source was installed so as not to be exposed from the liquid in the case of internal heating, and below the liquid level in the case of external heating. Then, the liquid level is detected by, for example, a level detector 7 with an H
It was performed by a level switch mechanism in which H, H, L, and LL were installed. In this case, the liquid level is usually controlled in the range of H to L, the liquid level height is detected by HH, and an alarm is issued.
Detects a low liquid level and issues an alarm.

As a method of supplying the liquid into the evaporator by detecting the liquid level, there is a continuous type or an intermittent type as shown in FIGS. 4 and 5, and a liquid level is provided above the heating source. I am maintaining. FIG. 4 shows a continuous liquid supply method, in which the opening amount of the control valve 5 is changed according to a command from the controller 4 in accordance with the difference between the detection value of the level detector 7 and the set level. Adjust. Further, FIG. 5 shows an intermittent liquid supply system,
When the level of the level detector 7 becomes L, the automatic valve 5 is opened to supply the liquid, and when the level becomes H, the automatic valve is opened to stop the supply of the liquid, thereby maintaining the liquid within a certain range. In the control method as described above, the number of detection units increases when detecting the liquid level, which easily causes a malfunction. Also,
Since the same type of detection end is used, there is concern about the reliability of the detection value.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems and has heat resistance, corrosion resistance, and durability, can stably detect the liquid level in a can, and can reliably detect abnormal liquid levels. An object of the present invention is to provide a concentrating / distilling device having a liquid level control mechanism.

[0005]

In order to solve the above-mentioned problems, the present invention detects the liquid level in a can and continuously controls it, and heats it from the inside or outside of the evaporation can to evaporate the liquid. In the distillation apparatus, a temperature sensor is attached to the inside or the outside of the evaporation can, and a liquid level control mechanism for detecting the liquid level in the can is provided by displacing the detected value of the temperature sensor. It is preferable that the liquid level control mechanism has a mechanism for detecting a decrease in the liquid level in the can and preventing empty heating. Also,
In the present invention, while continuously controlling by detecting the liquid level in the can, heating from the inside or outside of the evaporation can evaporates the liquid.
In the distillation apparatus, an optical sensor for controlling the liquid level is provided, a temperature sensor is installed inside the evaporation can, and a mechanism for detecting empty heating by the detection value of the temperature sensor is provided.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the concentrating / distilling apparatus of the present invention, since the liquid level control mechanism by the temperature sensor is provided as described above, the functions of the respective constitutions described in detail below can be obtained. This is a device that can detect the internal liquid level in a stable manner and reliably detect abnormal liquid levels. Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 shows a schematic configuration diagram for explaining an example of the present invention. In FIG. 1, 1
Is an evaporator, 2 is a heater, 3 is a temperature sensor, and 4 is a controller for controlling the supply valve 5 based on the detection value of the temperature sensor. The temperature sensor 3 is provided with temperature detectors HH, NOR, LL composed of thermocouples, and the surroundings are covered with a protective tube. The HH is arbitrarily provided at a height at which heat from the heater 2 is directly transmitted, NOR is provided at an arbitrary point above the upper end of the heater 2 and above the control liquid level, and L
L is provided at the upper end of the heater heating unit 2 and below the control liquid level.

Next, the liquid level control of the evaporator 1 will be described with reference to FIG. The supply valve 5 is opened / closed by the NOR level signal obtained by the temperature sensor 3, and the evaporator 1 is operated as follows.
Control the liquid level of. (1) When the detected temperature of the NOR level is the boiling temperature of the liquid, the supply valve 5 is closed. This indicates that the heat from the heater 2 was not directly detected by the thermometer due to the liquid in the can, and the liquid temperature was detected, indicating that the liquid surface was filled. (2) The NOR level detection temperature is
The supply valve 5 opens when detecting a temperature higher than 5 ° C. This indicates that the heat from the heater 2 has started to be directly detected by the temperature sensor 3, and indicates that the liquid level has dropped.

(3) The opening of the supply valve 5 is adjusted by using the controller 4 so that the detected temperature of the NOR level becomes a temperature higher by 2 to 5 ° C. than the boiling temperature of the liquid. Example Set value <Measured value → Large opening of supply valve 5 Set value> Measured value → Small opening of supply valve 5 With this configuration, the following effects are obtained. (1) Temperature measurement and level control can be performed simultaneously, and the number of equipment can be reduced. (2) Since the detection end of the temperature sensor is a thermocouple, it has excellent heat resistance and does not easily malfunction.

Next, the liquid level abnormality detection using the temperature sensor 3 will be described with reference to FIG. (1) Liquid level high (HH) detection by the temperature sensor 3, (a) In a steady state, the temperature sensor HH directly receives heat from the heater and indicates a temperature equal to or higher than the boiling point of the liquid. (B) When the liquid level in the can rises and there is liquid between the heater heating part and the temperature detection part, the HH temperature drops to the boiling temperature of the liquid. (C) Detects the temperature of (b) and issues an alarm of high liquid level.

(2) Low liquid level (L
Detection of L), (a) In the steady state, the temperature sensor LL is filled with the liquid in the surroundings and indicates the boiling temperature of the liquid. (B) When the liquid level in the can is lowered, the temperature from the heater heating portion is directly received by the temperature detecting portion, and this temperature rises. (C) Detects the temperature rise in (b) and issues a low liquid level alarm. The above-mentioned structure has the following effects. (1) By directly detecting the temperature without using a timer or the like, the abnormality can be found quickly, directly and reliably. (2) Since the temperature display is represented by a numerical value, it is easy to determine whether or not the sensor is malfunctioning, and it is possible to always check the operation of the sensor in a steady state.

FIG. 2 is a schematic diagram illustrating another example of the present invention. In FIG. 2, the temperature sensor 3 is connected to the abnormality detector 6 to detect an abnormality of the liquid surface, and the optical counter sensor 8
Is connected to the controller 4 to open / close the supply valve 5 to normally perform continuous liquid level control. Next, the control operation according to FIG. 2 will be described. (1) The supply valve 5 is opened / closed to continuously control the liquid level by measuring the time of a signal indicating the presence or absence of the liquid obtained from the optical facing sensor 8. At the same time, when a continuous signal with or without liquid is obtained for a certain period of time, an alarm is issued.

(2) By the temperature sensor 3, HH or L
At L, the temperature displacement difference from the steady state is measured, and an alarm of liquid level abnormality is issued. The above-mentioned configuration has the following effects. (1) The reliability of the alarm and the safety of the device are improved by simultaneously using different kinds of detectors. (2) Sensors with different detection methods are used at the same time, and the discrepancies in the outputs are detected to determine the malfunction or deterioration of each detector.

[0013]

According to the present invention, in a device for evaporating and concentrating / distilling a chemical liquid, a method for detecting the liquid level in a can, which is excellent in heat resistance, corrosion resistance, and durability, has been established, and the liquid level can be continuously maintained by a simple and inexpensive mechanism. By controlling to a constant value with, it is effective for the safety and stable operation of the device.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram illustrating a control mechanism of the present invention.

FIG. 2 is a schematic configuration diagram illustrating another control mechanism of the present invention.

FIG. 3 is a schematic configuration diagram illustrating a conventional control mechanism.

FIG. 4 is a schematic configuration diagram illustrating a continuous method of a conventional liquid supply method.

FIG. 5 is a schematic configuration diagram illustrating an intermittent method of a conventional liquid supply method.

[Explanation of symbols]

1: Evaporator, 2: Heater, 3: Temperature sensor, 4: Controller, 5: Supply valve, 6: Abnormality detector, 7: Level detector, 8: Optical counter sensor, 9: Liquid supply pipe, 10: steam,

Claims (3)

[Claims] 1. A liquid level in a can is detected and continuously controlled,
In a concentrating / distilling device that evaporates a liquid by heating from inside or outside of an evaporator, a temperature sensor is attached inside or outside the evaporator, and the liquid level in the can is detected by the displacement of the detected value of the temperature sensor. Concentrating / distilling device characterized by having a liquid level control mechanism for performing. 2. The concentrating / distilling apparatus according to claim 1, wherein the liquid level control mechanism has a mechanism for detecting a decrease in the liquid level in the can and preventing empty heating. 3. The liquid level in the can is detected and continuously controlled,
In a concentrating / distilling device that evaporates a liquid by heating from inside or outside the evaporator, an optical sensor for controlling the liquid level is provided, and a temperature sensor is installed inside the evaporator, and the empty value is detected by the temperature sensor. A concentrating / distilling device characterized by being equipped with a mechanism for detecting burning.