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Coal chemical and power --- industry share

Date:2017-2-21 15:10

★ pulverized coal flow rate, flow (non-nuclear technology) measurement
Pulverized coal flow rate, flow (non-nuclear technology) measurement equipment applications, there will often be three aspects of the problem:
1, due to equipment flow rate, density, flow measurement deviation, the user needs a substantial correction to meet the general production requirements;
2, abnormal large fluctuations in the measurement results, zero off phenomenon;
3, lining cracking, tear damage led to the overall replacement of the sensor, a substantial increase in user costs.


The key to the above problems lies in the following four points:
1, any by measuring the electrode spacing parameters or adjust the output signal corresponding to the measured value to adjust the flow rate roughly meet the production needs of the measuring equipment, which technically there must be a

Defect, high level equipment does not require any additional corrections (except for real-time and stability conditioning) when making flow rate measurements.
2, non-nuclear density (flow) measurement problems are mainly caused by two aspects, one is the density signal acquisition method (difference method) unreasonable, the original signal fluctuations

, Can not accurately reflect the density changes, adding a large number of stability algorithms later, resulting in density (flow) measurements deviate significantly from the actual value (usually larger), and open

Degree curve inconsistencies, this is a defect of the device itself; another reason is that without full accurate calibration put into use, resulting in measurement deviations, this is the use of equipment.
3, the real-time measurement results, accuracy and stability of the organic unity, the decisive factor is the normal working hours can cover the density of the working conditions, covered

The greater the density of the working range, the abnormal measurement results (sharp fluctuations, zero off, etc.) the less likely.
4, the sensor lining and structure directly determines the user's use and maintenance costs, most of the time the sensor damage is mainly lining damage, and lined the working life of the Lord

It depends on the material, the production process. At the same time whether the lining is replaceable determines the level of the user's post-maintenance costs.


★ 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 notThe 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 difference; composite frequency AC excitation technology should be high sampling frequency (microsecond level), curve reduction techniques can be completely removed the above two types of interference to ensure that the measurement results of fine

Indeed, 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), the size of the flow, the measured medium

Quality temperature, lining material, lining production process and other factors. At present, the sensor lined with colloidal material, its production process mostly in the form of semi-finished products by heating

Adhesive processing molding. There are two fatal flaws in this way. For any medium containing sharp objects (such as black water), any colloid lining can be easily damaged by scratches

; For high temperature measured medium, the process of lining the stainless steel body between the residual gas will heat up in the process of expansion led to lined drum. According to different working conditions

Pieces, choose a different lining material, the production process is the key to solve the above problems, such as the use of composite ceramic lining technology can solve the problem of scratches, the overall pouring plus

Vacuum processing technology can solve the drum problem.


★ nuclear application technology
The use of nuclear detection technology to solve chemical, metallurgical production level, density measurement problems, has been a very wide range of applications. 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, some of the equipment in the structural design, device selection and human-computer interaction arrangements flaw, the scene dust cover the circuit board, the device failure of curing, the key failure and other issues.
4, part of the equipment calculation model (especially continuous measurement of material level) can not guarantee the accuracy of the full range, only the highest position in the range, the lowest position to meet the accuracy requirements, the process of fine Insufficient degree.

TypeInfo: Industry share

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