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Power Plant Industry

Application Background in Power Plant Industry

Thermal power plants consume a large quantity of charcoal and it is one of the biggest sources of flue gas pollutants. The State Environmental Protection Bureau (SEPA) has so far endorsed a series of policies in order to better protect the environment and strengthen the monitoring of pollutant emission sources. On January 30, 2002, the State Environmental Protection Bureau formally issued The Notice on Issuing the Technical Policy for Prevention and Control of Sulfur Dioxide Emission from Charcoal Burning. The notice stipulated that the flue gas emission of thermal power units must be installed with on-line continuous monitoring devices for sulfur dioxide, smoke and other pollutants, and they must be connected to the management information system of the immediate environmental protection authorities.

 

In 2014, the National Development and Reform Commission and the Ministry of Environment Protection promulgated The Environmental Protection Electricity Pricing Policy for Charcoal-Burning Power Generation Units and the Monitoring Measure of Its Environment-Protection Facility Operation. The two state ministries stipulated that all charcoal-burning electricity-generation units must install protection facilities for desulfurization, denitrification and dust removal. Furthermore, an environment-protection deposit for desulfurization, denitrification and dust removal will be added to the grid electricity price for these units. At present, the deposit for desulfurization electricity price is 1.5 cents per kilowatt hour, denitrification electricity price 1 cent, and dust removal 0.2 cents. The new policy required that the operation of thermal power environmental protection facilities should meet the requirements of national and local pollutant emission control limits, and they would be assessed according to the hourly average concentration of single pollutant emissions. If the emission value was less than one time higher than the control limit, the environmental protection electricity deposit shall be confiscated but no further fine should be imposed. But if the emission exceeded one time higher than the control limits, a less than five-time fine would be imposed. Moreover, any fraud of online data would be severely punishe. 
 
With the increasingly stringent national environmental protection standards, the present environmental protection standard requires that the electrostatic precipitator of charcoal-burning power plants shall meet the emission standard of 30 mg/m3. At present, the main monitoring means of on-line dust emissions concentrations includes two methods which are micro-charge and optical monitoring.
 

Application Advantages:

A.Simple Installation: the front-end probe of the sensor may use installation methods of quick disconnect, 1/2 NPT or flange, or the probe could be directly inserted into a welding connection on the pipe.
B.Low operation and maintenance cost: the equipment is almost maintenance free during use. Its automatic continuous probe contamination & fault detection and range span detection do not need the regular manual zero-point inspection. Simply pull out the probe and wipe when necessary.
C.High reliability: the equipment needs only simple mechanical installation. The separate probe has higher anti-shock performance while the alloy probe is more corrosion-resistant.
D.Low requirements of measurement environment: the instrument is not affected by site electromagnetic interference, pipe length, size, shape and color of the particles, light absorption properties, etc. It is also not affected by temperature or humidity as long as there is not condensation.
E.More suitable for power plants: by fulfilling the environmental protection emission requirement, it also provides the user with continuous and accurate dust concentration signal values. A high-frequency switching power supply is presently applied to electrostatic precipitators; therefore, the power consumption of electrostatic precipitators can be optimized by adjusting the working cycle of electric fields when the dust concentration information at the inlet and outlet of the dust collector is acquired by using accurate feedback signals. The Particle Dynamic Analyzer can fully meet the feedback control requirements with its sensitive response and high measurement accuracy.
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