Stack 182 WS

As an approved particulate measurement system for compliance monitoring, the STACK 182 WS is suitable for measuring particulate emissions from wet scrubbers and other processes where the flue gas falls below dew point (cold stack conditions) or where water droplets are present.

STACK 182 WS has been designed for access to the measurement volume for external auditing. This is required for the AST linearity test for EN 14181 compliance.

How Does it Work?

The extractive instrument takes a representative continuous sample from the stack and heats this well above dew point. In turn, this evaporates water droplets and then measures the particulate concentration under dry conditions.

This heated, extractive approach overcomes the problems of condensation and water droplets associated with using in-situ particulate monitors.

Certified ProScatter™ Technology

The PCME STACK 182 WS uses an advanced ProScatter™ Forward Scatter sensor (PCME QAL 182). It is certified by TUV and MCERTS as QAL1 compliant.

With certification ranges covering both 0-15mg/m³ and 0-100mg/m³, the sensor is suitable for monitoring highly abated emissions.

Resolution and Sensitivity

The PCME QAL 182 sensor within the PCME STACK 182 WS uses a low-angle forward light scattering measurement principle unique to PCME (see ProScatter™ Forward Scatter). The measured ‘cone’ of scattered light is larger than in typical light scatter instruments, which provides:

• Excellent sensing resolution and sensitivity, due to an increased signal-to-noise ratio
• Reduced cross-sensitivity to changing particle size, allowing a greater range of application use.

System Self Checks

Flow rates and heater temperatures are continually monitored in the extractive flow line. This ensures any sample line blockages or problems with insufficient heating are automatically detected and avoided.

The system automatically indicates when valid measurements are occurring, hence avoiding any measurement errors during any system warm up. In addition, trace heaters may be added to the intake air to ensure there is no risk of condensation in the pipes.

Audit Tools & QAL3 Reporting

With a dedicated audit channel for QA data logging, the PCME QAL 182 sensor within the PCME STACK 182 WS has fully automated self checks (Zero and Span). The ProScatter™ 5-point Filter audit unit facilitates a comprehensive instrument check via a 5 point linearity check.

With the option of QAL Reporter for automated QAL3 reporting, it enables a simplified process for operators to meet QAL3 standards.

The PCME STACK 182 WS is suitable for:

• Stacks below dew point / with water droplets
• After wet scrubber arrestment plant
• After Flue Gas Desulphurisation (FGD) plant
• Flue gas velocity range 1-20m/s
• Corrosive flue gases (corrosion protection option)
• Variable particulate size

Typical Applications

The PCME STACK 182 WS is used to monitor emissions from the following types of processes:

• Coal and Oil fired power plant with FGD
• Waste incineration plant with wet scrubbers
• Pulp and paper recovery boilers
• Metallurgical and chemical processes with wet scrubbers
• Sugar beat dryers/boilers with high moisture in flue gas
• Particle board and fibre drying