Engineering

Construction Machinery and Others - Industry Share

Date:2017-2-21 16:45

★ liquid-solid two-phase flow measurement

In the use of electromagnetic technology to measure the flow of liquid-solid two-phase flow applications, mainly involves the following two aspects of the problem:

1, Due to the noise interference signal generated by the rubbing electrode of solid material (related to the concentration), the measurement accuracy and stability caused by the magnetic field interference of the magnetically conductive object. Do not

The same technical route to solve this problem is different. Square wave excitation technology because of the low sampling rate, can not fundamentally solve the above problems, only by adjusting the excitation

Frequency and software algorithms to be improved so that equipment to meet certain conditions (fixed media, fixed concentration) under the conditions of the use of different manufacturers to improve the quality of a certain effect

Of the frequency AC excitation technology should be high sampling frequency (microseconds), curve reduction technology can completely remove the above two types of interference to ensure accurate measurement results

, Stable, real-time organic unity.

2, due to the working conditions of the sensor lining damage caused by equipment life issues. Lining life by the solid form (particle size, sharpness), flow rate, pressure,

Lining material, lining production process and other factors. For media containing sharp objects (eg, coarse sand, coral reefs, gravel, pebbles, rocks, etc.), any glue

Body lining easily damaged due to scratches. According to different working conditions, choose a different lining material, the production process is the key to solve the above problems, composite ceramic lining technology

With its impact resistance, cutting, stripping ability to become the preferred solution to improve the working life of the sensor.

 

★ nuclear application technology

The use of nuclear detection technology to solve the problem of density measurement during the construction of dredgers has been widely used. Nuclear detection technology has the advantage of non-contact measurement, but due to the mystery of nuclear technology, professional, leading to the use of equipment in the following factors that affect the use of:

1, the application of personnel on the lack of knowledge of radiation, leading to blind panic or contempt, the safe place to work hard to get involved, the existence of radiation danger in the area can not effectively recognize

do not.

2, on the ray detection technology design related to the lack of basic knowledge of the equipment needs to be adjusted during use of the parameters are not understood, the correct parameters can not be set completely complete,

The equipment working condition accurately.

3, the lack of technical standards for measurement, equipment performance no uniform evaluation system.

Conductive fluid pipelines, the flow measurement using electromagnetic flowmeter. Liquid-solid two-phase fluids have their own characteristics, that is, both fluids in the fluid, as well as solids, lead to two distinct differences in the measurement of the flow of a single fluid medium using electromagnetic techniques When working conditions.
First, as compared with the case of measuring a single fluid medium, when measuring the liquid-solid two-phase fluid, the electromagnetic flowmeter electrode generates a large amount of interference signals due to the friction of the solid material

Number, the amount of solid content and its non-uniformity, making the identification and removal of interfering signals in the use of electromagnetic technology to measure liquid-solid two-phase fluid when the status of non-

Often important, poorly handled, poor measurement accuracy, or even impossible to achieve effective measurement.
Second, due to the presence of solid matter, it will produce various forms of friction with the pipe wall during the flow process, including common sense of frictional wear, cutting wear, erosion wear,

The proportion of all kinds of friction and wear depends on the pipeline morphology, solid content, solid form and uniformity of multiple factors. The level of sensor wear resistance directly

Determine the service life of equipment.
Thirdly, due to the complexity of liquid-solid two-phase fluids, there is no uniform assessment standard for the performance of such flowmeters in the world. The performance of the equipment can only be determined by the manufacturer

Based on its equipment in the measurement of the performance of a single fluid medium on the basis of self-declaration form. For users, because of the asymmetry of professional knowledge, from

Professional point of view to accurately determine the accuracy of an electromagnetic flowmeter liquid-solid two-phase flow performance is obviously unrealistic. A relatively crude and simple way to expose the device

The disadvantage is that the sensor pipe filled with water (static), the friction electrode with the object (a variety of ways), if no flow display, the surface of this device to meet the liquid-solid two

Phase flow measurement. Otherwise, its accuracy, real-time, and stability may not be satisfactory (or its declared performance) at the same time.

4, the concept of understanding there is bias, misled by some manufacturers, the life of the radioactive sources and their half-life confused.

TypeInfo: Industry share

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