Electrostatic Precipitator Electrostatic Precipitator Electrostatic Precipitator,High Pressure Electrostatic Precipitators,Tubular Electrostatic Precipitator,Tube Pole Type Electrostatic Precipitators Botou Youjian Environmental Protection Equipment Co. LTD. , http://www.btdustmachine.com
　　
2. Commissioning period failure
　　
Debugging expectation failures generally appear in the instrument installation and debugging phase. Once excluded, they will not appear again under the same conditions in the future. Common commissioning failures are often caused by improper installation, environmental disturbances, and fluid characteristics.
　　
1 ) Installation aspects
　　
Usually the fault is caused by incorrect installation position of the electromagnetic flow sensor. For example, the sensor is installed at the high point of the duct that is easy to accumulate gas; or it is installed on the vertical tube from top to bottom, and may be drained; or after the sensor Without back pressure, the fluid is discharged directly into the atmosphere to form a non-full tube in the measuring tube.
　　
2 ) Environmental aspects
　　
Usually mainly due to pipeline stray current interference, space strong electromagnetic wave interference, large motor magnetic field interference. Pipe stray current interference usually takes good single grounding protection to get satisfactory results, but if you encounter strong stray current (such as electrolysis shop piping, sometimes the peak potential Vpp induced on the two electrodes can be as high as 1V ), still Additional measures and insulation of the flow sensor and piping are required. Space electromagnetic interference is typically introduced via a signal cable and is typically protected by a single or multiple layers of shielding.
　　
3 ) Fluid aspects
　　
The evenly distributed microbubbles in the liquid to be tested usually do not affect the normal operation of the electromagnetic flowmeter, but as the bubbles increase, the instrument
The output signal of the meter will fluctuate. If the bubble is large enough to cover the entire surface of the electrode, the output signal will be more fluctuated as the bubble flows through the electrode and the electrode circuit will be momentarily broken.
　　
When the low-frequency square-wave excited electromagnetic flowmeter measures the solid content of too much slurry, it will also generate slurry noise, which will cause the output signal to fluctuate.
　　
When measuring mixed media, if the flow sensor is measured before the mixing is not uniform, the output signal will also fluctuate.
　　
Improper matching of the electrode material and the measured medium will also affect normal measurement due to chemical action or polarization. The electrode material should be properly selected according to the instrument selection or related manual.
　　
3. Runtime failure
　　
The fault in the running period is the fault that occurs after the electromagnetic flowmeter has been debugged and operated normally for a period of time. The common faults during the running period are generally caused by factors such as the adhesion layer on the inner wall of the flow sensor, lightning strikes and environmental conditions.
　　
1 ) Sensor inner wall adhesion layer
　　
Since electromagnetic flowmeters are commonly used to measure dirty fluids, after a period of operation, an adhesive layer often accumulates on the inner wall of the sensor to cause a malfunction. These failures are often caused by the electrical conductivity of the adhesion layer being too large or too small. If the attachment is an insulating layer, the electrode circuit will be broken and the meter will not work normally; if the conductivity of the adhesion layer is significantly higher than the fluid conductivity, the electrode circuit will be short-circuited.
　　
The meter also does not work properly. Therefore, the fouling layer in the measuring tube of the electromagnetic flowmeter should be removed in time.
　　
2 ) Lightning strike
　　
Lightning strikes easily induce high voltages and surge currents in the meter circuit, causing damage to the meter. It is mainly introduced through the power line or the excitation coil or the flow signal line between the sensor and the converter, especially from the control room power line.
　　
3 ) Changes in environmental conditions
　　
During commissioning, because the environmental conditions are still good (for example, there is no source of interference), the flowmeter works normally, and it is often easy to neglect the installation conditions (for example, the grounding is not very good). In this case, once the environmental conditions change, a new source of interference occurs during operation (such as welding on the pipeline near the flowmeter, installing a large transformer nearby, etc.), which will interfere with the normal operation of the meter, and the output of the flowmeter. The signal will fluctuate.
　　
4. Summary
　　
In the process of using the electromagnetic flowmeter, various faults may occur, but in general, all the faults can be classified into two types, that is, the commissioning period fault and the running period fault, as long as we pay attention to this in daily work. Two kinds of faults, and well eliminated, I believe that the electromagnetic flowmeter must be able to play its due role.
The principle of electrostatic precipitator is to use high voltage electric field to ionize the smoke. The dust charge in the airflow is separated from the airflow under the action of electric field. The negative electrode is made of metal wires with different cross-section shapes, called discharge electrodes.
Positive electrodes are made of metal plates of different shapes, called dust collecting electrodes. The performance of electrostatic precipitator is affected by three factors, such as dust property, equipment structure and flue gas velocity. The specific resistance of dust is an index to evaluate the conductivity. It has a direct effect on the efficiency of dust removal. When the resistance is too low, the dust particles are hard to keep on the dust collecting electrode, causing them to return to the airstream. When the specific resistance is too high, the charge of dust particles reaching the Dust Collector is not easy to release. The voltage gradient between the dust layers will cause partial breakdown and discharge. These conditions will result in a decrease in the efficiency of the dust removal.
Working principle
The basic principle of electrostatic precipitator is to collect dust in flue gas by electricity. It mainly includes four interrelated physical processes: (1) ionization of gases. (2) the charge of dust. (3) the charged dust moves toward the electrode. (4) the capture of charged dust.
The capture process of charged dust: on the two different metal anodes and cathodes with different radius of curvature, a high voltage direct current is used to maintain an electric field enough to ionize the gas. The electrons produced by the ionization of the gas, the anion and the cation, are adsorbed on the dust through the electric field, so that the dust can be charged. Under the action of the electric field force, the electrodes with different electrode properties move to the electrodes of different polarity and deposited on the electrode, so as to achieve the purpose of separation of dust and gas.
Characteristic
Compared with other dedusting equipment, electrostatic precipitator has less energy consumption and high dust removal efficiency. It is suitable for removing dust from 0.01 to 50 m in flue gas, and can be used in high temperature and pressure occasions. Practice shows that the larger the flue gas volume is, the more economical the investment and operation cost of electrostatic precipitator will be.
Technology of horizontal electrostatic precipitator with wide spacing
The HHD type wide spacing horizontal electrostatic precipitator is an introduction and reference of foreign advanced technology, combined with the characteristics of industrial furnace exhaust gas conditions in various industries in China, in order to adapt to the increasingly stringent emission requirements and the research and development of the WTO market standards. The results have been widely used in metallurgy, power, cement and other industries.
Optimum wide spacing and special plate configuration
The electric field intensity and the plate current distribution are more uniform, the drive speed can be increased by 1.3 times, and the trap dust is expanded to 101-1014 -cm in the range of resistance. It is especially suitable for the high resistance dust recovery of the waste gas of the vulcanized bed boiler, the new cement dry rotary kiln and the sintering machine and so on, and reduce or eliminate the reverse corona phenomenon.
A new RS corona line
The maximum length of up to 15 meters, with low halo voltage, corona current density, strong steel, never breakage, with high temperature resistance, resistance to heat change, combined with the top mode of blast cleaning effect is excellent. According to the concentration of dust, the corona wire density can be configured to meet the high dust concentration. The maximum allowable inlet concentration can reach 1000g/Nm 3.
Corona pole top vibrator
According to the theory of dust removal, the top electrode can be vibrated with strong vibration. Two optional ways of mechanical and electromagnetic can be adopted.
The free suspension of both yin and Yang
The dust collector and corona system of HHD electric dust collector use a three-dimensional suspension structure. When the exhaust gas temperature is too high, the dust collector and corona pole will expand freely in the three-dimensional direction. The collector system also specially designs the restraint structure of the heat resistant steel belt, which makes the HHD electric dust collector have a higher resistance to heat change and the commercial operation table. It is clear that the maximum temperature resistance of HHD electric dust collector is up to 390 degrees C.
Increase the acceleration of vibrator
The effect of dust cleaning is improved: the dust collector system has a direct effect on the efficiency of dust collecting. Most of the electric collector shows a decline in efficiency after a period of time. The main reason is the poor effect of the dust collecting plate. The HHD electric dust collector uses the latest impact theory and Practice results to change the traditional flat steel impact rod knot. It is constructed as a whole steel structure, and the structure of the side vibrator of the dust collector is simplified to reduce the drop weight by 2/3. The experiment shows that the minimum acceleration of the surface of the dust collector is increased from 220G to 356G.
Small area and light weight
As the discharge electrode system is designed by the top vibrator, and the unsymmetrical suspension design is used creatively for each electric field, and the design of the shell computer software is optimized by the American environmental equipment company, the total length of the electric dust collector is reduced by 3-5 meters and the weight is reduced by 15%.
High guarantee insulation system
In order to prevent the high voltage insulation material of the electrostatic precipitator from dewing and climbing, the shell is designed by the double inflatable roof of the heat storage. The electric heating adopts the latest PTC and PTS materials, and the bottom of the insulation casing is designed by the hyperbolic back blowing design, which completely eliminates the easy failure of the porcelain casing dew and creeping, and the maintenance and replacement are very convenient.
Matching L-C high system
High voltage control can be controlled by DSC system, upper computer operation, low voltage control using PLC control, and Chinese touch screen operation. The high voltage power supply uses constant current and high impedance DC power to match the HHD electrostatic precipitator body. It has the advantages of high dust removal efficiency, high specific resistance and high concentration.
Common faults in the use of electromagnetic flowmeters, some are faults caused by damage to the components of the instrument itself, and some are faults caused by improper selection, improper installation, environmental conditions, fluid characteristics, etc., such as display fluctuations, reduced accuracy, and even instrument damage. . It can generally be divided into two types: failures during installation and commissioning (debug during commissioning) and failures during normal operation (running faults).