Mercury Stack Monitor SM-4 mobile EMISSIONS Continuous Emissions Monitor (CEM) for Mercury Modular and demountable Mercury CEM • Easy transport • Easy assembly • Maintenance free converter directly at stack • Detects elemental, ionic and bound Mercury • Large measuring range: 0.05 to 1000 µg/m³ www.envea.global Introducing the SM-4 mobile by ENVEA GmbH The SM-4 mobile by ENVEA GmbH has been developed on the basis of the well proven stationary SM-4 CEM. Due to its modular design, the SM-4 mobile can easily be transported, assembled and disassembled. It is the ideal solution for the determination of total vapor phase mercury emissions at varying sites. Fits in almost every Typical industries for use of the SM-4 mobile Van or Station-wagon include coal fired power stations, waste incinerators, cement kilns and all other plants generating process gases which contain mercury traces in a complex matrix. Applications • Testing of permanent CEMs for compliance monitoring • Method 30A applications • Mercury control technologies optimization • Mercury stack testing Technology The heated sampling probe is mounted at stack. Sample gas is continuously drawn into a dilution unit by a maintenance free ejector pump, passing a heated particle filter. A critical orifi-ce stabilizes the sample flow thus making it independent of the pressure existing in the stack. The suction vacuum is continuously controlled by a sensor which guarantees correct function of the sample dilution. A partial flow of the diluted sample is passed through the catalyst where mercury is converted into the elemental state. Subsequently the sample is transported through a sample line to the mercury detector which may be tens or even some hundreds of feet away from the sampling probe. The detector uses a pre-concentration technique with the unique GoldTrap by ENVEA GmbH, thus making the SM-4 mobile one of the most sensitive mercury detectors in the market. Thermocatalytic converter Mercury present in stack gases is usually not only elemental but may also be ionic or bound mercury. In order to measure total mercury all these different mercury species have to be converted into the elemental form. For this the SM-4 mobile utilizes a dry thermo-catalytic method working at low temperatures. The advantages of a low temperature converter are fast heating up and cooling, low power consumption and the fact that materials like FKM (Viton®) , PTFE (Teflon®) or silicone can be used. The catalyst ensures that even under presence of oxidising matrix components the mercury conversion is 100 % complete. Sampling probe The sampling probe is an important part of the whole system as it has to extract a representative part of the sample gas and to supply it to the sample conditioning system. Sample wetted parts are made of Teflon® or silica coated stainless steel, guaranteeing a minimum affinity to mercury. The particle filter is automatically cleaned. An Every component can automatic valve allows to introduce calibration easily be carried by gas upstream the sample filter. two people Prevention of interferences Mercury measurement is commonly interfered by SO2, NOx, HCl, VOCś. Amalgamation alone, however, reaches its limits when the gold surface is affected by matrix constituents, whereas sample dilution alone may not be sufficient to cut down interferences to a tolerable level. The SM-4 mobile uses both: sample dilution and GoldTrap amalgamation for a complete elimination of interferences. Automatic calibration SM-4 mobile is packaged with a NIST Certified Calibrator which allows automatic and manual calibrations and span checks. It does not require refilling. Features and Benefits of the SM-4 mobile • Dry thermo catalytic method, no need for reagents, water refills or replacements of solid reagent cartridges • Sample dilution which eliminates interference from matrix gases like SO2, HCl, NOx • Extreme high sensitivity providing a low measuring range limit of 0.05 µg/m³ • Automatic blow back of particulate filter • Fast response: t(90) time typically 180 seconds • Sample line length up to 240 feet • Calibration gas generator integrated (NIST certified) System components: • Sampling probe with dilution and converter unit • Probe controller box • Heated bundle containing sample line, air supply line, calibration gas feed line • Analyzer cabinet with detector and calibrator • Air conditioning cabinet with pressure gauges, air filters, membrane dryer Technical Specifications Mercury Stack MonitorSM-4 mobile Dilution probe with thermo-catalytic converter Measurement technique at stack, fast loop to analyzer unit, atomic ab-sorption detector with GoldTrap Cold Vapor Atomic Absorption Spectrometry Principle of measurement (CVAAS) with amalgamation, wavelength 253.7 nm Measured component Total Hg Measuring range 0.05 µg/m³ to 1000 µg/m³ Hg Detection limit 0.0001 µg/m³ (detector); <0.05 µg/m³ (system) Response time Typically 180 sec 250 °C (482 °F); high temperature probe as opti-Max. sample temperature on for sample temperature up to 1000 °C (1800 °F) Ambient temperature range allowed -5 °C to 40 °C (23 °F to 104 °F) Sample line length Up to 90 m (240 ft) Signal output 4-20 mA (500 Ohm); RS232; modbus RTU/RS485 (option); ethernet (option) Status output 3 x pairs of relay contacts (dry contacts) Remote access Modem and software (option) Electrical power consumption 230 VAC or 115 VAC/50-60 Hz Analyzer box I: 60 x 60 x 60 cm (23.6”x 23.6”x 23.6”) HxWxD Analyzer box II: 73 x 60 x 60 cm Dimensions (28.7”x 23.6”x 23.6”) HxWxD Probe: 75 x 38 x 34 cm (29.5”x 15”x 13.4”) HxWxD Probe controller: 48 cm x 44 cm x 27 cm (18.9”x 17.3” x 10.6”) HxWxD Analyzer box I: 50 kg (110 lbs) Weight Analyzer box II: 50 kg (110 lbs) Probe controller: 12 kg (27 lbs) Probe converter unit: 30 kg (66 lbs) Air consumption 6 bar (87 PSI); peak 35 l/min (1.2 scfm) Calibration / span check Automatically, with integrated calibration gas generator (NIST certified) e Advantages of Atomic Absorption with Amalgamation: • No carrier gas needed • Higher sensitivity than systems without gold trap • AA is not prone to quenching effect • No compensation or background correction provisions required • Allows components like SO2, O2, NOx and organics to be present at levels 1000 to 100000 times higher than mercury • No zero drift due to amalgamation technique with Auto-Zero • Linear range over five orders of magnitude ©2020 ENVEA GmbH, Mercury Stack Monitor SM-4 mobile Specifications may be subjet to change without notic ENVEA GmbH Analytical Technologies As a leading supplier of high precision analytical Liebigstraße 5 equipment, we strive at all times to offer top quality D-85757 Karlsfeld solutions. Our products are manufactured according mail.mi@envea.global to the ISO 9001 quality regulations. Tel.: +49(0)8131 - 50 57 20 Fax.: +49(0)8131 - 50 57 22 ENVEA (Headquarters) 111 Bd Robespierre / CS 80004 78304 Poissy CEDEX 4 - FRANCE Visit us at: +33(0)1 39 22 38 00 www.envea.global info@envea.global