Dry Scrubbing was the First Webinar in our New Format Yesterday

A discussion format was used to discuss dry scrubbing in a 90 minute Webinar yesterday.  The discussion was based on information previously posted to

http://www.mcilvainecompany.com/DryScrubAnalysis/Subscriber/Default.htm

There were five expert panelists who were asked to comment on a series of questions. However, the other participants were urged to comment as well. Forty-five individuals and conference rooms were hooked up and included a number of utilities and A/Es.

Apologies to Mike Meadows, Sega, Inc. and Jeromy Jones, Sr. Engineer, Chemicals, Burns & McDonnell Engineering who, because of some communication errors on the part of McIlvaine, were not able to contribute.

Mitchell Krasnopoler, Manager, Air Quality, Kiewit Power Engineers & Construction provided a very comprehensive review of the different technologies and the suppliers as follows:

The Marsulex Technology has not been covered on the McIlvaine Dry Scrubbing website. It is a Chinese license and has two stages of humidification.

Paul Farber, Farber and Associates also provided a good analysis, not only of the technologies, but the differences in some of the components utilized.

Comparison of components and systems in dry scrubbing

Paul Farber presented good detailed analysis of components as well as systems. He compared rotary atomizer vs. dual fluid nozzles I SDA and addressed both the fluidized bed and NIDS as sub segments of CDS. For example NIDS is limited to much smaller modules. Dual fluid nozzle design has smaller footprint. Waste handling and DSI are also covered in extensive analysis

Shiaw Tseng, Manager of FGD Technology, Graymont, analyzed the U.S. installations and provided performance data for a number of them. He showed that these installations can meet MATS requirements at varying loads.

Mike Widico of KC Cottrell pointed out the unique advantages of the GSA scrubber including the use of cyclone to cut the load on the downstream particulate collector. This is particularly beneficial when operating a precipitator with a dry scrubber system.

Gas Suspension Absorber Technology for Multi-pollutant Control of Boiler Flue Gas Emissions

A recirculating bed dry scrubber technology capable of efficient acid gas control, – SO₂, HCl, and H₂SO₄. • Utilizes lime reagent either as dry hydrate or as lime slurry. • Coupled with ESP or FF for control of PM and PM-10 emissions. • Can incorporate ACI for control of Hg and dioxins/furans.    • Emissions of HCl, PM, Hg below MACT requirements.

Features and Benefits of KC Cottrell’s Gas Suspension Absorber (GSA) Technology

The lime can be injected either as a slurry, through commercially available two-fluid nozzle atomizers, or as powdered calcium hydroxide. The intense recirculation within the reactor promotes efficient acid gas neutralization, resulting in high removal efficiencies at low lime consumption rates. The nozzles are commercially available and can be changed out on the fly, without impacting scrubbing efficiency. The use of the cyclone to capture and recycle solids from the reactor vessel greatly reduces the demand on the downstream particulate collector. The slim profile of the GSA reactor vessel itself minimizes plan area requirements, which are frequently at a premium in retrofit applications.

Paulo Oliveira of Alstom was to present some material which was not displayed due to another glitch but here is the Alstom perspective of NID advantages.

There was an attempt to agree on major classifications. The consensus seemed to be that CDS and Entrained flow are level 2 categories under some heading such as chamber or vessel.

McIlvaine will be conducting periodic webinars and will continually add to the site. It will also conduct decisive analyses comparing each technology based on

• Response to load changes
• Lime consumption
• Lime quality requirements
• Sorbent handling
• Capital cost
• Ability to retain high efficiency with coal sulfur above 2 percent
• Parasitic load
• Reliability and maintenance
• Component insights

o   dual fluid nozzles vs. rotary atomizer

o   material handling

• Compatibility with downstream fabric filter or precipitators
• Space requirements

Offshore Experience

The evaluation of dry scrubbing has to take into account the Chinese experience. They have installed the largest CFB dry scrubbers and they have close to 20,000 MW of installations. This greatly exceeds that in any other country.  They also have a few SDA units and 5,000 MW of NID. So we will be seeking the input of the suppliers and users in China.

Going Forward

The intent is to expand and update the website in English and other languages. What are suggestions relative to

§  Format of continuously updated website just focused on dry scrubbing

§  Website to be free to everyone

§  Periodic webinars to discuss various aspects e.g., the next webinar is slated for a dry injection discussion

§  Continuous analysis of the options (free to utilities and subscribers)

§  Best method to incorporate papers in other languages

§  Coordination:  Should there be special coordination with dry scrubber users groups and various other organizations?

Mercury Treatment Chemicals in Fuel, Flue Gas and Scrubbing Liquor is Hot Topic Hour

April 10

McIlvaine is conducting a webinar on mercury removal options on April 10 at 10:00 am CST.  It will be a discussion of previously uploaded information on a dedicated site Mercury Removal - Continuous Analyses

The webinar will focus on three technologies: 

§  Technologies to oxidize mercury through adding halogens in the fuel and ductwork

§  Technologies to prevent re-emissions from the scrubber

§  Technologies to remove mercury from the wastewater

To register for the webinar click on http://home.mcilvainecompany.com/index.php/component/content/article?id=675

Here are some samples of the information on adding halogens in the fuel.

• Bromine-based Products for Mercury Emissions Reduction by Jon Lehmkuhler, Chemtura (Great Lakes) - Hot Topic Hour August 2, 2012

Bromine-based products that are available for mercury reduction.

Here is a representative sample of material to reduce re-emissions

• Heavy Metal Separation from Flue Gas Scrub Water with TMT15® presented by Rudiger Peldszus, Evonik Degussa GmbH - Hot Topic Hour June 16, 2011.

Ruediger Peldszus, Senior Manager for Applied Technology Advanced Intermediates at Evonik Degussa GmbH, backed up his claim that TMT 15^® is a good choice for separating heavy metals from flue gas scrubber water by citing a large number of installations in coal-fired power plants and also waste incineration plants. When asked how the chemical impacted the gypsum quality, Ruediger explained that the resultant compound is very small and exits the top of the hydroclone and not with the gypsum through the bottom. TMT 15 can also prevent mercury re-emission from the scrubber, but for this to be successful the parameters must be carefully evaluated. One of the participants has a client who has been challenged to successfully use the TMT 15 to prevent re-emission.