How applied eYc air velocity /volume transmitter in the activated carbon tower -- Exhaust gas emission solution

Industrial exhaust gas is one of the largest pollution of environmental air pollution. The urgent for improvement is not only because of regulatory compliance , but also includes the health considerations of on-site workers, odor and community safety issues. In the exhaust, the volatile organic compounds (VOCs) have been listed as the main domestic air pollution control items.

VOCs generated by industrial processes cause the most attention to air pollution issues, such as chemical, petrochemical, electronics, optoelectronics, semiconductor, metal processing, wastewater treatment, deodorization, wastewater treatment, etc,. 

Before the deodorization, the gas needs to be purified according to characteristics. Such as organic exhaust gas treatment, dust exhaust gas treatment, acid and alkali exhaust gas treatment, odor exhaust gas treatment and air sterilization and disinfection purification, after the purification treatment, the gas complies with the regulations then allow discharged into the environment.

Before the discharge, the flow rate, air volume, temperature and pressure must be monitored by the transmitter. Therefore, most factories will set up the continuous automatic monitoring equipment to monitor the discharge pipe. 

Use the transmitter to grasp the air pollutant emission situation and eliminate the abnormalities of air pollution control equipment to avoid the uncontrolled process resulting in a large amount of discharged air pollutants that exceed the amount stipulated by the Environmental Protection Agency.

Note: VOCs volatile organic compounds refer to organic compounds with a saturated vapor pressure greater than 70 Pa at normal temperature and a boiling point below 260 °C at ordinary pressure, or the vapor pressure is greater than or equal to 10 Pa at 20 °C with have corresponding volatility All organic compounds.

Application:

Taking the active carbon tower as an example, using the principle of active carbon adsorption, the exhaust gas is introduced into the active carbon filter layer to adsorb and deodorize, so as to achieve the purpose of purifying gas, and usually used in for the production of electronic element, the production of batteries (battery jar), and pickling operation, laboratory exhaust, metallurgy, chemical industry, medicine, coating, food, brewing and other exhaust gas treatment and purification, of which the most widely used in paint exhaust gas treatment.

Active carbon adsorption tower is dry exhaust gas treatment equipment, suitable for low levels concentration VOCs, generally between 100 ... 800 ppm@CH4, air volume about 80,000 ... 120,000 CMH. 

The treatment process is as follows: the exhaust gas will through the pre-filter to remove the dust , and then cool down to below 40℃ by the cooling system, sends the gas into the adsorption tank for adsorption by the power equipment , and then the active carbon adsorbs the polluted gas. At last, the clean gas is discharged into the atmosphere from the chimney.

Exhaust gas needs to meet the following regulations: If the emission of VOCs allowable reaches 1.3 kg per-hour or more, the inlet and outlet port of the purification equipment should be set up as a continuous automatic monitoring device such as air volume transmitters. 

In the activated carbon adsorption tower, we can choose to install it in each chimney discharge port, and the air duct before filtering, using RS-485 to connect eYc DPMF-M9 cumulative flow display controller, while monitoring instantaneous flow and cumulative flow.

For the flow chart of exhaust gas treatment, please refer to "eYc Exhaust emission flow monitoring solution"

Benefits:

Exhaust emission need to consider the flue gas flow rate, volume, temperature and pressure of the pipeline, as well as the characteristics of the exhaust gas such as: emission type, density, , corrosivity, water content, odor, flammability, corrosion resistance and dust resistance ect,.

After evaluation eYc FTM94/95 Industrial grade high accuracy thermal air velocity transmitter, it is suitable for severe industrial process environments and high accuracy, special double PT probe, high temperature resistance, dust resistance, can be used for micro-corrosion compressed air, measurement range up to 120 Nm/s (N: working condition (definition: 20°C at 1013 hPa), unit can be converted to Nm/s (Air velocity) or Nm3/h (Air volume) (optional), probe operating temperature to 120℃(Option 150℃), LCD Display(Top row: air velocity, Bottom row: temperature), aluminum alloy housing, housing IP65, probe IP67, can be directly installed on the pipeline to measure to reduce pressure loss and make the measurement more accurate.

FTM94/95 is a constant temperature hot wire anemometer. It uses the heat balance equation referred to as the King's Law to obtain the characteristic curve of the constant temperature hot wire anemometer.

eYc Specially developed unique linear regression, it could Linearly adjust this characteristic curve to make the measured data can get a more accurate and stable flow rate when doing signal conversion.

Conclusion

eYc FTM9495 Industrial grade high accuracy thermal air velocity transmitter solves the following problems, such as the exhaust gas contains dust and corrosion, which will cause the transmitter Not accurate enough and pressure loss. 

This transmitter also can meet the on-site application, switch easily for air velocity or air volume, more convenient for monitoring; the probe is protected by metal to meet the high temperature requirements of the industry. It can be installed in the inlet and outlet port to monitor the flow, effectively assisting customers in compliance with the emission standards of the Air Pollution , and also to protect our environment.