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★ 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 measuring equipment which can meet the production demand by adjusting the parameters of the electrode spacing or adjusting the output value corresponding to the measured value to adjust the flow velocity value must have some defects in technology. The high-level equipment does not need to carry out any measurement Be amended (except for real-time and stability conditioning).
2. Non-nuclear density (flow rate) measurement problems are mainly caused by two aspects. One is that the density signal acquisition method (difference method) is unreasonable, the original signal fluctuates greatly, the density variation can not be accurately reflected, and a large number of stability algorithms are added later, Resulting in density (flow) measurements deviate significantly from the actual value (usually larger), and the opening curve is inconsistent, this is a defect of the device itself; another reason is not put into use fully accurate calibration, and thus measurement deviation, this is the device Use problem
3, the real-time measurement results, accuracy and stability of the organic unity, the decisive factor is the normal operation of the equipment can cover the scope of the density of the working conditions, the coverage of the density of the larger the scope of work, abnormal measurement results (Swings, dropouts and other phenomena) the lower the chance.
4, the sensor lining and structure directly determines the user's use and maintenance costs, most of the damage to the sensor is mainly lining damage, and the working life of the lining depends mainly 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 the solid material (related to the concentration), the measurement accuracy and stability caused by the magnetic field interference of the magnetically conductive object. Different technical routes have different abilities to solve this problem. Because of the low sampling rate, square wave excitation technology can not fundamentally solve the above problems and can only be improved by adjusting the excitation frequency and software algorithms to meet the requirements of the equipment under certain conditions (fixed medium, fixed concentration) , Different equipment manufacturers to improve the effect of a certain difference; composite AC frequency excitation technology should be high sampling frequency (microsecond level), curve reduction technology can be completely removed the above two types of interference to ensure accurate, stable, real-time organic unity .
2, due to the working conditions of the sensor lining damage caused by equipment life issues. Liner life by the solid form (particle size, sharpness), the size of the flow rate, the measured medium 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 the bonding process. This way there are two fatal flaws, for medium containing sharp objects (such as black water, etc.), any colloid lining easily damaged due to scratches; for high temperature measured medium, the process of lined with stainless steel body The residual gas will swell between the heating process leading to lining the drum. According to different conditions and conditions, choose a different liner 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 use of integral casting 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, application personnel lack of knowledge about radiation, leading to blind panic or contempt, the safe place to work hard to get involved, there is a danger of radiation can not effectively identify the area.
2. There is not enough basic knowledge about the design of ray detection technology, the parameters to be calibrated during the process of equipment use are not well understood, and the relevant parameters can not be correctly and completely set, which affects the accurate working of the whole equipment.
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 bit in the range, the lowest bit to meet the accuracy requirements, the lack of process accuracy.