1. sources of VOC

At present, the main oil collected by domestic gas stations is gasoline. Due to the low boiling point of light oil such as gasoline and its own volatile and other physical characteristics, hydrocarbons in gas stations areVOCproduction is inevitable. Under normal circumstances, the normal operation of the gas stationVOCmainly occurs in two links:In the loading and unloading operation, the oil tanker unloads oil to the oil tank through the oil pipeline, the oil tank liquid level rises to form a positive pressure, and the saturated oil vapor in the oil tank is discharged into the atmosphere from the vent pipe.(This process is also known as the "big breath");In the process of refueling operation, due to the non-tight connection between the refueling gun and the fuel tank port, a large amount of oil and gas are discharged into the atmosphere from the fuel tank port. In addition, due to the change of ambient temperature, the saturated oil and gas in the oil tank also has breathing loss, but the emission of this part is relatively small.Volatile organic compounds (VOC) is an important precursor for the formation of ozone, which comes from all aspects of production and life. The main sources are petrochemical, chemical, oil storage, transportation and marketing.

Composition of on-line monitoring system for 2. VOC

VOCsOn-line alarm monitoring system is applied VOC Gas concentration detection and VOC Gas concentration standard alarm, can be detected VOC Gas concentration and display on siteVOC Gas real-time concentration value, standard sound and light alarm, the use of wireless monitoring technology, grid fine layout, all-weather comprehensive monitoring of air pollution, to achieve comprehensive coverage of air pollution monitoring factors in the region.,Standard signal output, with signal stability, sensitivity and high accuracy, flameproof connection mode is suitable for ambient air and peripheral gasVOCConcentration change trend or interval, monitoring unorganized emissions or open area whether there is a significant abnormal concentration standard problem, mainly used for leakage warning and environmental monitoring, plant pollution emission monitoring.

3. VOC Sensor Selection

In view of this situation, here is a recommend.PIDSensorPID-AH5. This is a special test developed by the British company AlphaVOCGas sensors,Designed for diffusion and in-line pumped sampling, the sensor provides excellent response time and clearance. The sensor uses a bulb with special brightness and stability, which can reliably detect weak volatile and difficult to detect compounds over a long period of time.PIDThe sensor has the characteristics of high precision, non-destructive to the detection gas, fast response speed, long life and wide application range.

The following isPID-AH5Basic parameters of the sensor:

1.     Range:1ppb~40ppm

2.     T90Response time:2s

3.     Typical sensitivity:50mv/ppm

4.     Supply voltage:3.2—5.5VDC

5.     Output signal:0.040—2.85V

6.     Power consumption:80—200mw(depending on supply voltage)

7.     Temperature range:-20℃—+60℃

8. Relative humidity range: 0-95% RHNo condensation