FGD, DeNOx, DeSOx – control precisely the absorber/neutralizer injection
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.
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> Heated Multi-Gas NDIR-GFC analyzer
MIR 9000H
> Total mercury emissions monitor in stack flue gases
SM-5 mercury CEMS
> Solids mass flow 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.
RELATED CONTENT:
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
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> Point level monitoring
ProGap 2.0
> Point level monitoring
ProGap 2.0-BS
2
Mass flow measurement of absorbent
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> Solids mass flow measurement up to 20 t/h
SolidFlow 2.0
3
Flow / No flow detection at cyclone outlet
-
4
Ash level detection at filter outlets
-
> Point level monitoring
ProGap 2.0
> Point level monitoring
ProGap 2.0-BS
5
Flow detection at ash transportation system
6
Continuous level measurement in storage silos
-
> Continuous level monitoring
Nico 120
> Point level monitoring
ProGap 2.0
7
Individual chamber baghouse performance monitoring
8
Predictive bag filter row monitoring
9
Process gas monitoring : CO, O2
-
> NDIR-GFC Multi-Gas Analyzer
MIR 9000e
9
Process gas monitoring : NO, NH3 (if SNCR)
-
> Heated Multi-Gas NDIR-GFC analyzer
MIR 9000H
9
Process gas monitoring : SO2, HCl, NOx, Hg
-
> Mercury Sorbent Trap System
Amesa-M
> SO₂ UV absorption Analyzer
MIR 9000ASD
> NDIR-GFC Multi-Gas Analyzer
MIR 9000e
> Heated Multi-Gas NDIR-GFC analyzer
MIR 9000H
11
Process leakage detection : VOCs, NOx, SO₂, Hg, particulates
-
> Ambient air dust monitoring
AirSafe 2
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