Junray ZR-D05G Flue Gas Preconditioner

Overview

The Junray ZR-D05G Flue Gas Preconditioner is an engineered inline sample conditioning system designed for real-time, high-fidelity pretreatment of hot, saturated flue gas streams prior to instrumental analysis. It operates on the principle of thermoelectrically controlled condensation—utilizing a variable-frequency compressor-based refrigeration cycle—to selectively remove water vapor while minimizing analyte loss (e.g., SO₂, NOₓ, NH₃, H₂S) through proprietary acid-gas retention technology. Unlike passive chilling or permeation dryers, the ZR-D05G integrates active dew point control, heated transport pathways, and chemically inert flow paths to preserve the thermodynamic and compositional integrity of wet stack emissions. This makes it especially suited for compliance-grade monitoring in continuous emission monitoring systems (CEMS), portable infrared gas analyzers (e.g., ZR-3220), and laboratory reference methods requiring trace-level accuracy under high-humidity conditions (up to 30 vol.% H₂O).

Key Features

• Variable-frequency compressor refrigeration system enabling precise, energy-efficient dew point control across ambient temperatures from −20 °C to +50 °C
• Dedicated phosphoric acid injection module compliant with JJG 968–2002, reducing SO₂ adsorption losses and suppressing interference from NH₃ and H₂S
• Custom-designed condensate separation chamber with integrated PTFE-coated stainless-steel cold traps and self-draining geometry
• High-efficiency particulate and sulfate aerosol filtration using replaceable sintered metal and hydrophobic membrane cartridges (cut-off ≤0.3 µm)
• Fully heated internal gas path (maintained at ≥120 °C) to prevent recondensation and wall adsorption downstream of the dryer
• 4.3-inch capacitive touchscreen interface with multilingual menu navigation, real-time dew point display, and system diagnostics logging
• Quick-connect inlet port (ISO-KF 25 compatible) for seamless integration with ZR-D03B heated sampling probes and other ISO-standard flue gas probes
• Modular architecture supporting optional add-ons including the ZR-D28 NO₂-to-NO catalytic converter (heated to 650 °C, ±5 °C stability)

Sample Compatibility & Compliance

The ZR-D05G is validated for use with flue gases containing up to 30 vol.% water vapor, CO₂ concentrations up to 20%, O₂ up to 21%, and trace pollutants including SO₂ (0–5000 ppm), NOₓ (0–2000 ppm), CO (0–10,000 ppm), H₂S (0–200 ppm), and HCl (0–100 ppm). Its design adheres to the physical and chemical requirements outlined in HJ 692–2014 (NDIR measurement of NOₓ), HJ 629–2011 and HJ 57–2017 (SO₂ determination by NDIR and potentiostatic electrolysis), and JJG 968–2002 (verification procedures for flue gas analyzers). All wetted materials—including fluoropolymer-lined stainless-steel tubing, ceramic valves, and glass-reinforced PTFE gaskets—are certified per ASTM F2136 for chemical resistance to acidic condensates and oxidizing agents. The unit supports GLP-compliant operation via timestamped event logs and configurable alarm thresholds.

Software & Data Management

The embedded microcontroller firmware (v3.2+) provides local data acquisition at 1 Hz resolution for dew point temperature, inlet/outlet gas temperature, refrigerant pressure, filter differential pressure, and system status flags. All operational parameters are accessible via RS-232 and optional Modbus RTU (RS-485) interfaces for integration into SCADA or CEMS host systems. Configuration and calibration history are stored in non-volatile memory with write-protection enabled. While the ZR-D05G does not include cloud connectivity, its data output format is fully compatible with EPA-approved CEMS data acquisition systems (DAS) and satisfies audit trail requirements under US EPA 40 CFR Part 60 Appendix B and ISO 14064-3 for greenhouse gas verification.

Applications

• Preconditioning of stack emissions for portable NDIR analyzers (e.g., ZR-3220) in field-based regulatory inspections
• Primary moisture removal stage in extractive CEMS installations for coal-fired, biomass, and waste-to-energy plants
• Reference method support for Method 6C (SO₂), Method 7E (NOₓ), and Method 10 (CO) testing per US EPA protocols
• Research-grade sampling for atmospheric chemistry studies involving reactive nitrogen and sulfur species under humid conditions
• Calibration gas delivery conditioning where stable, dry, particle-free carrier gas is required for dynamic dilution systems

FAQ

What is the maximum allowable inlet gas temperature?
The ZR-D05G accepts flue gas up to 180 °C at the inlet when used with the ZR-D03B heated probe; sustained exposure above this threshold requires upstream dilution or quenching.
Does the unit meet FDA 21 CFR Part 11 requirements?
No—the ZR-D05G is not a regulated medical device nor part of a pharmaceutical process train; however, its audit-ready logging meets analogous data integrity expectations for environmental compliance applications.
Can the phosphoric acid reagent be replaced in the field?
Yes—reagent cartridges are user-serviceable with standard tools and require replacement every 30 days under continuous operation at 25 °C ambient.
Is the ZR-D05G suitable for chlorine-containing flue gas?
Yes—wetted components are resistant to HCl and Cl₂ up to 100 ppm at ≤120 °C; extended exposure above these limits necessitates custom material upgrades.
How often must the particulate filter be cleaned or replaced?
Under typical power plant sampling conditions (≤5 mg/m³ dust loading), the dual-stage filter assembly requires cleaning every 72 hours and full replacement every 30 operational days.