AMS Mercury Sampling System for Flue Gas

Overview

The AMS Mercury Sampling System for Flue Gas is a rigorously engineered, field-deployable solution designed for the quantitative collection and preservation of elemental and oxidized mercury species (Hg⁰, Hg²⁺) from industrial flue gas streams. Based on the principle of isokinetic sampling coupled with inert, temperature-controlled adsorption and absorption, the system ensures representative capture without artifact formation or analyte loss. It adheres strictly to the European standard UNI-EN 13211 (equivalent to ISO 17892-4 for solid waste leaching, but adapted here for flue gas Hg speciation protocols), which defines performance criteria for sampling accuracy, thermal management, and material compatibility in high-temperature, corrosive environments. The system’s core architecture eliminates all metallic contact surfaces—sample gas flows exclusively through heated borosilicate glass probes, quartz-lined filters, and inert impinger trains—thereby preventing catalytic reduction, adsorption, or re-emission of mercury compounds during transit.

Key Features

• Inert sample path constructed entirely from high-purity borosilicate glass and quartz components—no stainless steel, nickel alloys, or other reactive metals in direct contact with the gas stream.
• Heated sampling probe with real-time temperature monitoring; maintained at ≥120 °C to exceed acid dew point by ≥20 °C, suppressing condensation of sulfuric and hydrochloric acid vapors that could cause mercury volatility or deposition losses.
• Minimized residence time (<5 seconds) between probe inlet and first absorption bottle, achieved via compact thermal design and optimized flow geometry—critical for preserving redox-sensitive mercury species.
• Modular heated filtration unit with ceramic or quartz fiber filter media, integrated upstream of the impinger train to separate particulate-bound mercury (Hg_p) prior to gaseous phase capture.
• Configurable impinger train (typically 2–4 stages) using standardized solutions such as KMnO₄/H₂SO₄, KCl, or NaOH for selective retention of Hg²⁺, Hg⁰, and halogenated mercury compounds.
• Support for three validated operational modes: fully automated sequential sampling, semi-automated manual-triggered acquisition, and derivative sampling (derivative dilution method) for high-concentration or transient emission scenarios.

Sample Compatibility & Compliance

The AMS Mercury Sampling System is validated for use across coal-fired power plants, waste incinerators, cement kilns, and non-ferrous metal smelters—environments characterized by high particulate load, acidic gases (SO₂, HCl, NO_x), and variable moisture content. Its inert construction and thermal control meet the material integrity requirements of EN 13211 Annex B for mercury speciation sampling. While not a certified reference method per EPA Method 29 or ASTM D6784-22, it serves as a compliant field sampling platform compatible with subsequent laboratory analysis by Cold Vapor Atomic Fluorescence Spectrometry (CVAFS) or ICP-MS. All glassware conforms to DIN/ISO 3585 specifications for borosilicate 3.3 glass, ensuring dimensional stability and chemical resistance under prolonged thermal cycling.

Software & Data Management

The system operates in conjunction with optional AMS-compatible data loggers (e.g., AMS DL-2000 series) that record real-time parameters including probe temperature, sampling flow rate, total volume, pressure drop across the filter, and elapsed sampling duration. Data output complies with ISO/IEC 17025 documentation requirements and supports audit-ready CSV or XML export. When deployed in regulated environments subject to EU Industrial Emissions Directive (IED) reporting or national mercury inventories, the logger provides timestamped, tamper-evident records traceable to NIST-traceable flow calibrators. Full GLP-compliant audit trails—including user login, parameter changes, and calibration events—are retained for ≥12 months.

Applications

• Compliance monitoring of mercury emissions under the EU IED and U.S. MATS (Mercury and Air Toxics Standards).
• Source testing for mercury speciation (Hg⁰ vs. Hg²⁺) to inform sorbent injection optimization in flue gas desulfurization (FGD) and selective catalytic reduction (SCR) systems.
• Validation of continuous mercury monitors (CMMs) via parallel manual sampling campaigns.
• Research-grade sampling for kinetic studies on mercury re-emission from wet FGD slurry or activated carbon injection breakthrough behavior.
• Baseline characterization of mercury partitioning in emerging combustion technologies (e.g., oxy-fuel, biomass co-firing).

FAQ

Does this system comply with EPA Method 29?
No—the AMS Mercury Sampling System is designed to meet UNI-EN 13211 and supports equivalent analytical workflows, but it is not pre-certified as an EPA Method 29 apparatus. Users must validate its equivalence per 40 CFR Part 63, Appendix A if submitting data to U.S. regulatory authorities.
Can the system collect both particulate and gaseous mercury simultaneously?
Yes—via integrated heated filtration followed by multi-stage impinger absorption, enabling concurrent quantification of Hg_p, Hg²⁺, and Hg⁰ fractions.
Is calibration traceable to international standards?
Flow calibration is performed using NIST-traceable primary standards (e.g., dry gas meters or critical orifices); temperature sensors are calibrated against PT100 reference probes accredited to ISO/IEC 17025.
What maintenance intervals are recommended for field deployment?
Glass components require post-run cleaning with 10% HNO₃ and ultrapure water; quartz filters should be replaced after every 3–5 sampling events in high-dust environments; heater insulation integrity should be verified quarterly.