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Information regarding Mercury Abatement, FGD Liquors and Dissolved Metals Concentrations in FGD Wastewater. There is a big difference in selenium and mercury concentration in the scrubbing liquor which has to be process rather than fuel related.
Revision Date: 4/10/2014
Tags: 221112 - Fossil Fuel 化石燃料, Allen Analytics, Mercury, Mercury Removal
Treatment Chemical Case Studies by Bruce Keiser, Nalco. - Hot Topic Hour April 10, 2014
Nalco offers chemicals to solve the mercury emission problem for coal-fired boilers. One chemical is designed to inject in the boiler, another is injected in the scrubber and a third in the wastewater. The chemical quantities can be varied in order to compensate for process variables. For example the SCR does a better job of oxidizing mercury when the catalyst is new than later in the campaign. As the oxidation potential deteriorates the quantity of chemicals can be increased.
Revision Date: 4/9/2014
Tags: 221112 - Fossil Fuel 化石燃料, Nalco, Mercury, Chemical, Mercury Removal
Bromine can accumulate in the scrubber recycle. Confirmation of the accumulation was determined in a study at Lower Colorado River Authority (LCRA). John Grocki advised the attendees that there are big variations even between units at the same plant. There is a range of concentrations which can be of concern. Bromine and Chlorine cannot be treated the same and the combination has a different impact than either one independently. So whether there will be corrosion and which material is best to protect against it is based on the concentrations of both halogens. In addition to the scrubber itself, the injection of halogens in the fuel can have impacts on the air heater and ductwork.
Revision Date: 4/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, URS Corp., Mercury, Bromine, Corrosion, Mercury Removal
Chemtura can supply bromine as calcium bromide or in many other forms. The company works with clients from inception through continuing operational support. Setting up calcium bromide systems is relatively easy but there is no reason to over-design and invest more than necessary or to under-design and create operational problems. Chemtura is conducting tests which show the impact of bromine in the gas and scrubbing liquor on the materials with which it may come in contact. The quantity of bromine added can vary to compensate for changes in the process e.g., changes in fuels or deterioration of the catalyst. Since activated carbon is quite expensive it makes sense to utilize bromine with the fuel to supplement the carbon under upset conditions.
Revision Date: 4/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, Chemtura, Mercury, Bromine, Chemical, Corrosion, Mercury Removal
This scrubber additive prevents re-emissions and creates solids which are easily separated from the FGD wastewater. GRE is successfully operating a system with this chemical at its Bismarck, ND plant. Addition of CaBr in the scrubber improves overall efficiency.
Revision Date: 4/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, Great River Energy, Mercury, Chemical, Mercury, Wastewater Treatment, Re-Emission, Mercury Removal
HClear™ can be injected in the duct ahead of the particulate device and removes HCl without removing SO2. It is not a sodium product and does not impact ash sales. Very high removal rates are achieved at less than 25 lbsHClear/ton of coal. There is significant value in decreasing scrubber corrosion and wastewater treatment costs.
Revision Date: 4/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, Fuel Tech, Sorbent, Mercury, HCl, Mercury Removal
Straightening the flow at KCP&L LaCygne Unit 1 has provided uniform flow in the SCR hood to prevent flyash accumulation. This results in reduced catalyst replacement costs and reduced vacuum removal costs for deposits, according to Reid Thomas.
Revision Date: 4/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, Fuel Tech, Mercury, Chemical, SCR, Mercury Removal
The kaolin-based sorbent is readily available and cost effective.
Revision Date: 4/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, BASF, Mercury, Sorbent, Mercury Removal
CBI is continuing to optimize its mercury reduction technology and is validating the cost effectiveness of a new re-emissions treatment chemical - Redox.
Revision Date: 4/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, CB&I, Mercury, Bromine, Chemical, Mercury Removal