On-Site Assessment of Compliance On-Site Assessment of Compliance - PowerPoint PPT Presentation

On-Site Assessment of Compliance On-Site Assessment of Compliance Monitoring - Gaseous Species Monitoring - Gaseous Species (Manual Methods) (Manual Methods) Dave Scott & Alan Leonard Dave Scott & Alan Leonard AEA Technology Environment AEA Technology Environment

Sampling Gaseous Species Sampling Gaseous Species There are a wide range of gaseous species There are a wide range of gaseous species commonly monitored in Part B processes, eg eg: : commonly monitored in Part B processes, g Acid Gases ( Acid Gases (HCl HCl, SO2, HF) , SO2, HF) g g Combustion Gases (CO, CO2, O2, Combustion Gases (CO, CO2, O2, NOx NOx) ) g g VOCs VOCs g « = NVVU= ^ b^ = qÉÅ Üåç logy plc

Sampling Gaseous Species Sampling Gaseous Species g Most species can be monitored using manual Most species can be monitored using manual g extractive wet chemical methods. extractive wet chemical methods. g Some can also be monitored using instrumental Some can also be monitored using instrumental g techniques. techniques. g The former are always periodic, the latter can be The former are always periodic, the latter can be g periodic or continuous. periodic or continuous. « = NVVU= ^ b^ = qÉÅ Üåç logy plc

Important Points - Manual Extractive Important Points - Manual Extractive Gaseous Sampling (I) Gaseous Sampling (I) g Unlike particles, gases are not greatly affected by Unlike particles, gases are not greatly affected by g inertial effects. inertial effects. g Choice of suitable sampling position much simpler. Choice of suitable sampling position much simpler. g g Isokinetic Isokinetic sampling not normally necessary. sampling not normally necessary. g g Single point sampling usually suffices. Single point sampling usually suffices. g « = NVVU= ^ b^ = qÉÅ Üåç logy plc

Important Points - Manual Extractive Important Points - Manual Extractive Gaseous Sampling (II) Gaseous Sampling (II) g Nozzle geometry not normally important. Nozzle geometry not normally important. g g Particulate matter needs to be removed. Particulate matter needs to be removed. g g If gases are soluble condensation losses need to be If gases are soluble condensation losses need to be g avoided. avoided. g Glasswear Glasswear needs to be chemically clean. needs to be chemically clean. g « = NVVU= ^ b^ = qÉÅ Üåç logy plc

Important Points - Manual Extractive Important Points - Manual Extractive Gaseous Sampling (III) Gaseous Sampling (III) g Absorbing solutions need to be made of appropriate Absorbing solutions need to be made of appropriate g grade chemicals. grade chemicals. g If gases are reactive inert sampling materials are If gases are reactive inert sampling materials are g required. required. g Absorption efficiency needs to be good (>90%). Absorption efficiency needs to be good (>90%). g g Gas volumes need to be accurately measured. Gas volumes need to be accurately measured. g « = NVVU= ^ b^ = qÉÅ Üåç logy plc

Important Points - Manual Extractive Important Points - Manual Extractive Gaseous Sampling (IV) Gaseous Sampling (IV) g Minimum gas volumes need to satisfy sensitivity Minimum gas volumes need to satisfy sensitivity g criteria. criteria. g Solutions need to be carefully recovered. Solutions need to be carefully recovered. g g Analytical system needs to be sensitive and specific. Analytical system needs to be sensitive and specific. g g Blank corrections need to be made. Blank corrections need to be made. g « = NVVU= ^ b^ = qÉÅ Üåç logy plc

Common Manual Gas Sampling Common Manual Gas Sampling Standards Standards g HCl HCl - EN 1911, EPA 26, EPA 26A. - EN 1911, EPA 26, EPA 26A. g g SO2 - BS 6069, ISO 11632, EPA 6B, CEN in SO2 - BS 6069, ISO 11632, EPA 6B, CEN in g prep. prep. g HF - EPA 13B; ISO in prep. HF - EPA 13B; ISO in prep. g g NOx NOx - EPA 7D - EPA 7D g g VOC ( VOC (speciated speciated) - CEN in prep ) - CEN in prep g « = NVVU= ^ b^ = qÉÅ Üåç logy plc

Manual Gaseous Samplers Manual Gaseous Samplers g Commercial systems available, Commercial systems available, eg eg Andersen and Andersen and g Severn Science systems. Severn Science systems. g In-House systems also widely used. In-House systems also widely used. g « = NVVU= ^ b^ = qÉÅ Üåç logy plc

Manual Gaseous Samplers Manual Gaseous Samplers g Essential common components include: Essential common components include: g - probe - probe - filter - filter - absorbers and absorber solutions - absorbers and absorber solutions - cooling bath - cooling bath - flow controller and pump - flow controller and pump - flow rate meter - flow rate meter - gas meter - gas meter « = NVVU= ^ b^ = qÉÅ Üåç logy plc

Gas Sampling Systems (I) Gas Sampling Systems (I) « = NVVU= ^ b^ = qÉÅ Üåç logy plc

Gas Sampling Systems (II) Gas Sampling Systems (II) « = NVVU= ^ b^ = qÉÅ Üåç logy plc