JPS59214717A - Liquid-level measuring method in hollow body - Google Patents

Abstract

PURPOSE:To obtain distillation efficiency as designed, by probing the surface of vibrating liquid in a hollow body from the outside of the hollow body by an ultrasonic wave probe, capturing the change in a reflected wave, detecting the liquid level, thereby measuring the liquid level in a downcomer part, and grasping the state of the inside. CONSTITUTION:A probe piece B1 of an ultrasonic wave probe B is moved up and down along the outer wall surface of a distilling column and ultrasonic probing is performed. The pattern of the reflected wave appeared on a CRT B2 is identified, and the liquid level in each downcomer part A2 is detected. The ultrasonic wave probe B is constituted of the following parts: a transmitting part B3, which generates high voltage electric pulses and sends them to the probe B1; the probe piece B1, which converts electric pulse into an ultrasonic wave by a vibrator and converts the reflected wave into a voltage; an amplifier part B5, which amplifies the voltage generated in a vibrator based on the reflected wave; an attenuator (sensitivity adjuster) B6, which converts the received voltage into the size suitable for the CRT B2; a receiving part B4 comprising the amplifier part B5 and the attenuator B6; the CRT B2, which displays the voltage from the receiving part B4 on a vertical axis and the voltage from a time axis part B7 on a horizontal axis; and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring a liquid level in a hollow body, and more specifically, the present invention relates to a method for measuring a liquid level in a hollow body, and more particularly, it relates to a method for measuring a liquid level in a hollow body, and more particularly, a method for measuring a liquid level in a hollow body, such as a distillation column, absorption column, reaction column, adsorption column, washing column, extraction column <y d-) (for measuring the liquid level inside the tower) Regarding the most suitable measurement method.

It is impossible to grasp the internal conditions of these various towers and tanks during their operation, and
``Increased productivity''-1 Improvements, reforms, and destruction of new equipment for the purpose of security, rationalization, etc.! It will be a difficult material to obtain for l”J.

For example, in a distillation column during purification, if the flow rate of the distillation column is too high or too low, an efficient distillation effect cannot be obtained. Although there is a need to understand the internal situation, there is currently no plan for YJ.

The present invention solves the above-mentioned problems by vibrating the liquid level inside hollow bodies such as various towers and turrets.
It is characterized by detecting the liquid level by detecting changes in reflected waves while conducting ultrasonic probes from outside the hollow body using a probe of an ultrasonic probe. In other words, the internal state of the hollow body is determined by measuring the liquid level, and if the hollow body is a tray-type distillation IWt, the internal state of the hollow body is determined by measuring the liquid level. We propose a measurement system that can measure the liquid level in a part of the downcomer, grasp the internal state, and obtain the distillation efficiency as designed.

The embodiments of the present invention will be described above with respect to a hollow body (Δ) which is a tray type distillation column.

Hollow body (△〉Zunawara distillation column is a seal pan (A1)...
・It is equipped with multiple tiers of ・During operation, A・Ile is placed on the lower seat pan (A1) from the beginning, and a portion of each town pan (A2) is placed on the lower seat pan (A1).
), the air was mixed with a flow pressure, and the liquid level (C+) was pumped up 1! The distilled water is allowed to flow down (distilled). This distillation jM is probed by ultrasonic waves by moving the probe (B1) of [3] up and down along the outer wall of the column A. , identify the pattern of foul waves appearing on the CRT (B2), and select each downcomer part (A2) k: C
3.Detects the liquid level.

A specific example of this will be explained with reference to FIG. 2. At the measurement point (3), the pattern of the foul wave appearing on the CRT (B2) has the following characteristics.

1) There is almost no movement of the reflected waves.

■) The number of reflected waves is small and Terumaro is high.

Analyzing this, ■) indicates that there is no local attenuation of ultrasonic waves, and ■) indicates that there is no local attenuation of ultrasonic waves, and ■) indicates that there is no change in the sound pressure reflectance on the inner surface of the outer wall of the tower, indicating that the waves reflected from inside the tower. In addition, J: The reflectance on the inner surface of the outer wall of the tower is 100%, and (2) the gas phase is <03) inside.

Measurement point ■ III) Almost the same as I) yl> Slight imaging can be seen in the foul wave.

Analyzing this, it can be seen that m)N) is close to the state of I)II>, and (2) there is a gas phase (C3)T inside. Also ll
The slight photograph in 2) shows that the inner surface of the outer wall of the tower is covered with bubbles, and it can be seen that the gas-liquid phase is close to the bottom.

Measurement location ■ M) CRT (B2 > Below I) a similar pattern appears, but the sound pressure level is quite low.

■) A very unstable reflected wave (which changes greatly up and down with violent vibrations) appears above CRI' (B2).

Analyzing this, ■) shows a decrease in the sound pressure reflectance on the inner surface of the outer wall of the tower, indicating that there is a substance inside that transmits ultrasonic waves, and ■) shows that the ultrasonic waves that passed inside the tower This shows that the gas is momentarily reflected by a break in the material (bubble), etc., and as a result, there is an extremely unstable gas-liquid phase (C2) inside.
), it can be seen that there is an upper level.

Measurement location ■ ■) The foul wave vibrates very violently and changes greatly up and down.

Analyzing this, ■) indicates that the sound reflection rate on the inner surface of the outer wall of the tower has become even lower, and the phenomenon described in ■) has become more pronounced. It can be seen that a liquid phase (C2) exists4.

Measurement point ■ i) The foul wave appears thinly and shoots violently.

However, there is no major change in the vertical direction.

■) There are many reflected waves.

Analyzing this, ■) indicates that the passage rate of ultrasonic waves into the interior is quite stable, and ■) indicates that there are countless reflectors inside. It can be seen that a relatively stable gas-liquid phase (C2) exists inside the chamber.

Measurement location ■X) Slight vibration is observed in the reflected waves, but it is relatively stable and the number of reflected waves is smaller than ■).

Analyzing this, it shows that the passage rate of ultrasonic waves into the interior of ) is found to exist.

In this way, the flow ω of each stage in the distillation column can be grasped, and the presence and level of the gas-liquid phase (C2) can also be grasped.

The ultrasonic probe (B) used in the measurement of the present invention is public, 11
Noshino(, generate high voltage electric pulse and probe j'<
13. +,
A probe (B1) that converts waves into voltage, and an amplification section (85) J'i that amplifies the electric current F generated in the vibrator by the reflected waves.
, J: A receiving section (Ba) consisting of an attenuator (sensitivity adjuster) <136) that converts the received wave voltage to a CRT (B2.) into a 11-level signal, and a receiving section <13. +) on the vertical axis, after i! The voltage from the time 11ql+ part (B7) of Is is displayed on the horizontal axis.
It consists of an interplane shaft part (+: 37) that moves the bright spot (towards the slot 1) horizontally at a constant speed and emits a voltage.

In summary, the present invention has the following advantages.

■ The liquid level inside the hollow body can be measured and understood from the outside.

■ In distillation columns, etc., where it is essential to know the flow rate, the internal state, that is, the state of the auxiliary equipment, can be accurately determined by determining the liquid level. Can only be supervised from

■ It is now possible to understand the internal state of a hollow body such as a distillation column, which was previously impossible to understand, and its distillation efficiency alone is excellent.
It can provide important data on the design of the distillation column itself.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing an example in which the measuring method of the present invention is applied to a distillation column. Figure 2 is a partially enlarged cross-sectional view of the measuring method of the present invention. Figure 3 is an ultrasonic probe used in the measuring method of the present invention. This is a block diagram. In the figure (△>), the hollow body (13) is the ultrasonic probe (1B+), and the probe (C1) is the liquid level.

Claims (1)

[Claims] The liquid level inside the body and the inside of the body is vibrated, and the liquid level in this vibrating state is
A method for measuring the liquid level inside a hollow body, which is characterized by detecting the liquid level by detecting changes in the reflected waves while performing ultrasonic exploration with a probe of an ultrasonic probe from outside the hollow body. .