Stack emission sampling
Hydrochloride Acid chimney sampling according to norm UNI-EN 1911 DLgs.152-2006
The system concerns a heated sonde including a set of glass tools to sample hydrochloride acid sampling gas getting in touch without affecting any metal part. A special impinger’s support deviceis placed outside the sonde, next to the heated recipient holding the filter holder. This process avoid forming condense in the sampling chain with the loss of the specimen. Normative allows two different kinds of sampling, the first one regards Isokineticwiththe derivation of theflux for dusts, the other one is only for gas monitor whether there are some particles or not as aerosol form.
The device might be placed directly linked to the heated sonde with the heated filter holder (600/SIR1500BB) thanks to glass unions. The speciment is absorbed through three impingers seal and refrigerated straight in to the recipient placed behind the sonde.
The heated sonde might be used with a kit of accessories and increasing the number of the impingers positioned in the refrigerated tank, or sampling metals in emission according to method EPA 29, 26° and EN-14385.
Hydrochloride Acid sampling might be executed with a double withdrawal system, one for gas part with standard process and three bubblers, the other one for dust and foreseen gas in isokineticism in real time.
Sampling device has to be designed to reduce gas time to the minimum between sonde nozzle and bubbling absorbers (less than 5s). The heated sonde and inlet nozzle must be manufactured in according with norm ISO 9096:1992. The requirements of the inlet nozzle edge might be less binding because these parts are often made of borosilicate glass not very workable to rigid tolerances. Sonde temperature must be checked at least at 120°C and also 20°C over the acid dew gas point. The heating device must be designed to reduce to the minimum the non-heated area next to the filter holder union. Membrane holder must containing a filtering material with efficiency over 99,5% for the volume maximum effective flow the filter to avoid measurement error due to saline chloride particles that might be analyzed as hydrochloride acid (HCL).
The most appropriate filters are flat, made of glass fiber or different diameters of quartz. The filter holder must be heated to maintain steady gas temperature. The derivationfor the line ofimpingersfor collection hydrochloride acid is placed downstream of the outletthefilter holder and its aspiration flow has to be between 2 and 3 liters per minute. The main line will be definite with isokintetic criteria; will have a flux between 30 e 150 liters per minute (according to the withdrawal tools).
Non-isokintetic sampling: Device does not concern isokintetic sampling mode in real time. The filter holder must have a heated tank (withdrawal feeler is the same as the isokintetic option) and linked directly to the bubblers attached at the output, two of them with sintered septum containing a solution adsorption and an empty impinger without septum. Sampling time is directly proportioned to gas and foreseen limits concentration. On average a sampling has a concentration range in between 1mg/m3 and 10mg/m3and requires a volume between 50 and 200 air liters, with a sampling time not less than 30 minutes. Due to lower gas concentrations, sampling time might be extended.
Semi authomatic method