Detection method and device of boiling state

A technology of boiling state and detection method, which is applied in the investigation stage/state change, etc., can solve the problems of inability to accurately detect the change of boiling state in real time, and achieve the effect of sensitive change, high cost and high detection accuracy

Inactive Publication Date: 2013-05-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem that the existing detection technology cannot accurately detect the change of the boiling state in real time in some industrial heat exchange equipment, and a method and device for detecting the boiling state are provided

Method used

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  • Detection method and device of boiling state
  • Detection method and device of boiling state
  • Detection method and device of boiling state

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A 1000 mL glass beaker with a heating coil is used as the heating vessel, water is used as the boiling medium, and the experimental pressure is 1 atm. The voltage of the heating coil is controlled by a voltage regulator, and the coil has a built-in thermocouple for measuring the temperature of the heating coil and displaying it through a digital display regulator. The acoustic wave sensor is attached to the outer wall of the glass at a distance of 2 cm from the bottom of the glass, which is the bubble accumulation area near the heating coil. The acoustic wave detection system includes an acoustic wave sensor, a preamplifier, a main amplifier, a signal acquisition card, a signal processing device and a display device. The frequency of the acoustic wave detection system is 500 kHz, and the sampling time is 10 s. The temperature of the heating wire and the water temperature were recorded and the acoustic signal was collected every 20 s. The heating voltage is 150 V. The...

Embodiment 2

[0045] A 1000 mL glass beaker with a heating coil is used as the heating vessel, water is used as the boiling medium, and the experimental pressure is 1 atm. The voltage of the heating coil is controlled by a voltage regulator, and the coil has a built-in thermocouple for measuring the temperature of the heating coil and displaying it through a digital display regulator. The acoustic wave sensor is attached to the outer wall of the glass at a distance of 3 cm from the bottom of the glass, which is the bubble accumulation area near the heating coil. The acoustic wave detection system includes an acoustic wave sensor, a preamplifier, a main amplifier, a signal acquisition card, a signal processing device and a display device. The frequency of the acoustic wave detection system is 500 kHz, and the sampling time is 10 s. The temperature of the heating wire and the water temperature were recorded and the acoustic signal was collected every 20 s. The heating voltage is 170 V. The...

Embodiment 3

[0051] A 3000 mL glass vessel with stainless steel tubes was used as the experimental vessel, and water was used as the boiling medium. The stainless steel tube introduces low-voltage direct current and high current through the electrode to heat the stainless steel tube. The heat source tube is placed in a glass container filled with water, and the voltage of the electrode tube can be adjusted to change the heat load on the surface of the heat source tube, and the formation, growth and detachment process of bubbles can be observed. The stainless steel tube is used for temperature measurement with a copper-constantan thermocouple inserted into the tube. The experimental pressure is 1 atm. The acoustic wave sensor is attached to the outer wall of the container at the same height as the heating stainless steel pipe. The acoustic wave detection system includes an acoustic wave sensor, a preamplifier, a main amplifier, a signal acquisition card, a signal processing device and a d...

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Abstract

The invention relates to a sound emission detection method of a water boiling state and mainly solves the problem in the prior art that the change of the boiling state in one part of industrial heat-exchanging equipment cannot be accurately detected in real time. The method comprises the following steps of: (1) receiving a sound signal inside the heat-exchanging equipment; (2) selecting total energy, standard deviation, average absolute deviation and a main frequency of the sound signal as characteristic parameters; and (3) analyzing changing characteristics of the characteristic parameters and taking a k value as a criterion to detect the boiling state in the heat-exchanging equipment and conversion thereof online in real time. The method can be used for accurately and effectively obtaining the characteristic parameters of signals, can be used for easily and conveniently detecting the boiling state and the conversion of the heat-exchanging equipment on line in real time. The invention further discloses a detection device comprising a signal receiving device, a signal amplification device, a signal collection device, a signal processing device, an output displaying device and a control device. The device is in a non-invading type, is simple, easy and convenient to use, and has strong applicability to the different heat-exchanging equipment.

Description

technical field [0001] The invention relates to the field of acoustic emission technology detection methods and devices, in particular to an acoustic emission detection method and device for water boiling state. Background technique [0002] As a heat transfer technology, boiling has the characteristics of high heat transfer rate and small heat transfer temperature difference. It is widely used in nuclear energy construction, thermal energy engineering, refrigeration industry, chemical engineering and other fields. Water is the most commonly used boiling medium, which has the advantages of cheap and easy to obtain, high heat of vaporization, and large heat capacity. [0003] According to the degree of superheat (that is, the difference between the heating surface temperature and the saturation temperature of water), the boiling curve can be divided into four typical heat transfer regions, namely natural convection region, nucleate boiling region, transitional boiling region ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/12
Inventor 王靖岱张擎黄正梁阳永荣蒋斌波董克增杨遥何乐路蒋云涛
Owner ZHEJIANG UNIV
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