FGD, DeNOx, DeSOx – control precisely the absorber/neutralizer injection

Acids, Mercury, Dioxins, VOC abatement | MIR 9000H, MIR IS, LAS 300-XD, SM-5, SolidFlow 2.0

Material: raw gases HCl, NOx, Hg, SO2, (CO, O2, H2O)

Installation: before the injection point

Function: online monitoring of gas parameters allowing for precise adjustment of absorber/neutralizer injection, to comply with emission regulations (ELV)

(9) •• Pollutants abatement
During combustion or incineration process, acids are produced due to the composition of the fuels or plastics or other materials contained in the waste. Neutralization/absorption of these species prior to the dust filtration treatment is essential to avoid damage to the filter media and excess of emissions.
This operation is carried out by injecting a quantity of lime, limestone slurry, active carbon powder or sodium bicarbonate powder proportional to the pollutant concentrations (dioxins, furans, heavy metals, acids).
In order to adjust precisely this pollutant reduction in real time, on-line monitoring of HCl, NOx, Hg or SO2 (precursor of SO3 and sulfuric acid derivates) must be set on the process, before the injection point.
Measuring the water content could also be interesting as it would allow the detection of a possible leak in the boiler.

SOLUTION

In this purpose, ENVEA recommends the use of its extractive multi-gas NDIR solutions such as the MIR 9000H,
the MIR-IS or the in-situ monitor LAS 300-XD based on TDL technology.
For the Mercury abatement control, ENVEA recommends its SM-4 online mercury analyzer.

MIR 9000H
MIR 9000H
MIR IS
LAS 300 XD
SM-4
Solid volume measurement up to 20 t/h
SolidFlow 2.0

CUSTOMER BENEFITS

  • Important savings on reagent consumption and related costs.
  • Less reagent injected lead to a reduction of bottom ash quantity. Consequently, treatment costs of this solid outputs, most of time considered as hazardous, are significantly reduced.
  • Improved process robustness and reduced maintenance.
  • Reduction of stack emissions and therefore compliance with regulatory ELV limits and air pollution reduction.
  • Measuring the H2O content would avoid dampness of the reagent, which may lead to pasty deposits on the treatment filters, as well as the detection of a possible leak in the boiler.
Point level detection in charging chuteMass flow measurement of absorbentFlow / No flow detection at cyclone outletAsh level detection at filter outletsFlow detection at ash transportation systemContinuous level measurement in storage silosIndividual chamber baghouse performance monitoringPredictive bag filter row monitoringProcess gas monitoring : CO, O2Stack compliance measurement : NOx, SO₂, CO, CO₂, O₂, NH₃, HCI, HF, H₂O, Hg, TOC, PCDD/F, dust and flowProcess leakage detection : VOCs, NOx, SO₂, Hg, particulatesProcess gas monitoring : SO2, HCl, NOx, HgProcess gas monitoring : NO, NH3 (if SNCR)

1

Point level detection in charging chute

2

Mass flow measurement of absorbent

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Flow / No flow detection at cyclone outlet

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Ash level detection at filter outlets

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Flow detection at ash transportation system

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Continuous level measurement in storage silos

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Individual chamber baghouse performance monitoring

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Predictive bag filter row monitoring

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Process gas monitoring : CO, O2

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Process gas monitoring : NO, NH3 (if SNCR)

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Process gas monitoring : SO2, HCl, NOx, Hg

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Stack compliance measurement : NOx, SO₂, CO, CO₂, O₂, NH₃, HCI, HF, H₂O, Hg, TOC, PCDD/F, dust and flow

More

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Process leakage detection : VOCs, NOx, SO₂, Hg, particulates