WAYEAL CEMS 1200 Continuous Emission Monitoring System

Overview

The WAYEAL CEMS 1200 Continuous Emission Monitoring System is an integrated, modular analytical platform engineered for regulatory-compliant, real-time monitoring of gaseous and particulate pollutants in industrial flue gas streams. Based on thermal-wet extractive sampling and differential optical absorption spectroscopy (DOAS) for SO₂ and NOₓ quantification, the system maintains sample temperature between 120 °C and 200 °C throughout the measurement path to prevent condensation-induced analyte loss—particularly critical for accurate SO₂ detection where aqueous absorption and sulfurous acid formation would otherwise compromise data integrity. Particulate matter is measured in-situ using forward-scattered laser light (90° scattering geometry), enabling high-sensitivity detection down to 0.1 mg/m³ with minimal drift. The system meets functional requirements specified under Chinese national standards HJ 75–2017 and HJ 76–2017 for CEMS performance verification and is designed to support compliance with ultra-low emission thresholds—specifically ≤35 mg/m³ SO₂, ≤50 mg/m³ NOₓ, and ≤10 mg/m³ PM—as mandated by China’s Ministry of Ecology and Environment (MEE), National Development and Reform Commission (NDRC), and National Energy Administration (NEA) for retrofitted or newly built coal-fired power units.

Key Features

• Thermal-wet measurement architecture with programmable heated sample line (120–200 °C) and probe, eliminating condensation artifacts during SO₂ and NOₓ analysis
• Differential Optical Absorption Spectroscopy (DOAS) core for gaseous pollutants—provides inherent compensation for interferences from water vapor, particulate scattering, and spectral overlap
• In-situ forward-scatter laser PM sensor with automatic zero/span validation and temperature/pressure compensation
• Modular subsystem design: gas analyzer module (SO₂/NOₓ/O₂/CO/CO₂/HCl), particulate monitor, flue gas parameter module (velocity, static pressure, humidity), and data acquisition & control unit
• Pulsed xenon lamp light source (rated lifetime ≥100,000 hours) paired with fixed grating spectrometer and linear CCD array detector—no moving optical components ensures long-term mechanical stability
• Integrated data handling with local storage (≥30 days raw data), remote diagnostics via secure TCP/IP interface, and configurable alarm thresholds per parameter

Sample Compatibility & Compliance

The CEMS 1200 is validated for use across high-dust, high-humidity flue gas environments typical of coal-fired boilers, sintering plants, cement kilns, and chemical synthesis furnaces. It supports flue gas temperatures up to 200 °C and dust loadings up to 10 g/m³. All subcomponents comply with electromagnetic compatibility (EMC) Class B per GB/T 18268.1–2010 and safety requirements per GB 4793.1–2007. The system architecture supports audit-ready data logging aligned with GLP principles, including timestamped event logs, operator action records, calibration history, and instrument status flags. While not pre-certified to EN 15267 or US EPA PS-11, its DOAS-based gas analysis methodology is functionally equivalent to reference methods specified in EPA Method 6C and ISO 12039 for SO₂ and NOₓ.

Software & Data Management

The embedded CEMS Control Suite (v3.2+) provides a Windows-based HMI with dual-mode operation: local touchscreen interface and remote web access via HTTPS-secured portal. All measurements are time-stamped to UTC and stored with millisecond resolution. Data export supports CSV, XML, and MODBUS TCP protocols for integration into plant DCS (e.g., Siemens Desigo, Honeywell Experion) and provincial environmental monitoring platforms (e.g., MEE’s National Pollutant Discharge Monitoring Platform). Audit trail functionality complies with basic 21 CFR Part 11 expectations—user login authentication, electronic signature prompts for calibration events, and immutable record archiving. Automated daily QA/QC reports include zero/span drift checks, calibration gas certificate traceability, and uptime statistics.

Applications

The CEMS 1200 is deployed in stationary source emission monitoring across energy-intensive sectors requiring continuous regulatory reporting. Primary application domains include:

• Coal- and biomass-fired power generation units operating under ultra-low emission policies
• Iron and steel production facilities—sintering machines, blast furnace stoves, coke ovens
• Cement clinker production lines with multi-stage preheaters and rotary kilns
• Chemical manufacturing sites emitting acidic gases (HCl, SO₂) and process-related NOₓ
• Waste-to-energy incineration plants subject to EU IED-aligned emission limits

System configuration can be scaled from single-stack monitoring to multi-point networked deployment using fiber-optic backbone infrastructure.

FAQ

What regulatory standards does the CEMS 1200 meet?
It conforms to HJ 75–2017 (Technical Specification for Operation of CEMS) and HJ 76–2017 (Technical Specification for CEMS Performance Acceptance Test), the mandatory frameworks for CEMS installation, commissioning, and operational verification in China.
Can the system integrate with existing DCS or enterprise-level SCADA systems?
Yes—via standard MODBUS TCP, OPC UA, or 4–20 mA analog outputs; optional protocol gateways support Profibus DP and Foundation Fieldbus.
Is humid flue gas conditioning required prior to analysis?
No—the thermal-wet design eliminates the need for chilled mirror or Nafion dryers; all gas stream components remain above dew point throughout transport and measurement.
How often is calibration required?
Zero/span calibration is recommended every 24 hours for regulatory compliance; automated calibration cycles can be scheduled and logged within the software.
What maintenance intervals are recommended for the laser PM sensor?
Optical window cleaning is advised every 7–14 days depending on dust loading; full alignment verification is performed during quarterly preventive maintenance.