HOT TOPIC HOUR

HOT TOPIC HOUR

Hot Gas Filter Discussion Hot Topic Hour July 2

The Hot Topic Hour yesterday was a discussion based on http://home.mcilvainecompany.com/images/Hot_Gas_Filter_Decision_Guide_April_30_2015.pdf

(A general description of the session and participants appears in the Alert last week). So this is just a high level overview.

Power, cement, and other operators of plants with combustion sources need to increase the efficiency now delivered by dry precipitators. Here are many of the options available.

Option	Considerations
Upgrade precipitator	Cheapest solution but may not meet 5 mg/Nm³
Install bags in ESP casing	Widely chosen solution from Russia to Chile
Install 350°F catalytic filter in precipitator casing with DSI	Why not? Remove NO_x and dust. Tri Mer is supplying systems to remove PM, NO_x and acid gases. But Rod Gravely says there is not enough room for catalytic filter elements. Clear Edge and FLS/AFT/Haldor Topsoe are suppliers.
Replace precipitator casing with tower e.g., Kiewit	If you have a limited footprint you can build a stacked module 400 feet high in a pre-designed granary tower which can hold the weight. So the existing footprint for the precipitator is used for NO_x, SO_x, and PM removal. This is great for retrofits in the U.S and China but more so for India and other countries which need it all.
850°F catalytic filter with DSI	Requires greater installation cost but cheaper than separate PM, NO_x, and scrubber modules. Clear Edge and Haldor Topsoe are suppliers. Dürr and Clear Chem have a unique approach. Lhoist has lots of DSI experience with Sorbocal. Pentair demonstrates the ability to engineer cleaning solutions to meet the conditions.
Series of filters at different temperatures	Big potential for rare earth recovery. What if the ceramic filter prior to the air heater is sized for larger particles and synthetic media filter after the AH captures the small? Is the rare earth concentration in one higher than another? This could be huge.
Catalytic filter with HCl DSI	Haldor Topsoe catalytic sulfuric acid process as demonstrated at First Energy. Could be a winner for high sulfur coal.

A brief summary does not do justice to the webinar yesterday. So readers are urged to view the recording. But here are a few more points.

The Supreme Court ruling this week will not diminish the hot gas opportunity.

There is the opportunity for programs from FLS and others which provide guaranteed bag life and can be structured on an annual fixed cost basis.

The whole issue of bag management starts with quality control in bag manufacturing. John McKenna of ETS explained how this should be done. There is also the need to supervise installation to avoid bag damage. Eddie Ricketts says the membrane bags, when installed with covers, will not be damaged. But you need to follow procedures.

The coordination of Pentair and suppliers such as CECO on the Big Stone precipitator conversion to optimize bag design based on cleaning variables is cost-effective as opposed to first selecting the bag design and then worry about how to clean it.
We have been reporting on a limited number of players with ceramic and metal media but newcomers such as Rath are entering this high growth market.

What about unconventional approaches for ultra high efficiency and low cost? We barely touched on some options which would combine for higher efficiency than any conventional system.

Hot gas filter with DSI, heat exchange to 200°F and then direct condensing heat exchanger discharging ultrapure air at 70°F (35°F needed for CO₂ ammonia system but any gas in the pipeline must be very clean).
Downstream use of ozone and scrubber for ultra high NO_x control.
Downstream mercury module e.g., Gore.
Tail end WESP.

Hot gas filtration is the biggest market in air pollution control at present and with the new developments can only grow rapidly. It is technology driven, so the McIlvaine Decision Guide will be a critical tool.

The entire July 2 recording can be heard at: Hot Gas Filtration 110 minutes

Hot Gas Filtration Webinar - Hot Topic Hour July 2, 2015

The Hot Topic Hour yesterday was a discussion based on http://home.mcilvainecompany.com/images/Hot_Gas_Filter_Decision_Guide_April_30_2015.pdf (A general description of the session and participants appears in the Alert last week). So this was just a high level overview.

Revision Date: 7/2/2015

Tags: 221112 - Fossil Fuel 化石燃料