 UltraTemp Filtration System Controls
Particulate PM, HCl / SO2, and NOx
Tri-Mer Corporation, specializing in advanced technologies for the control of fine particulate
and pollutant gases, has introduced UltraTemp Filtration, a hot gas filtration system that
captures particulate to extremely low levels, including submicron and ultrafine PM.
A new generation of fiber-based ceramic filter is the key.
- Operation up to 1650°F.
- Typical PM removal to less than 0.001 grains/dscf (2 mg/Nm3).
For acid gas removal, the system incorporates dry sorbent injection for very efficient dry
scrubbing of SO2 , HCl, and other acid gases.
- Typical SO2 results of 90-97% removal.
Another option is use of filter elements with embedded SCR catalyst, so that with
urea/ammonia injection upstream of the filter housing yields a high degree of NOx control.
- Typical NOx results up to 95% removal.
Small UltraTemp module incorporating new ceramic filter tubes.
Inset: Ceramic filter tubes in the UltraTemp Filtration system for hot gas filtration.
Applications of the Tri-Mer UltraTemp Filtration system include syngas cleaning, glass
production, waste incineration, and biomass pyrolysis. UltraTemp Filtration is also an excellent
way to achieve ICI boiler MACT compliance for coal, biomass, and wood. Other applications
include metal smelting, mineral processing and chemical production.
The heart of the UltraTemp Hot Gas Filtration system is a new generation of ceramic filter tubes.
Earlier generations of ceramic filters – sometimes called “candle” filters – were manufactured
from high-density granular powders similar to common ceramic products. While effective, they
were brittle, with low thermal shock resistance, and were prone to cracking and breakage from
thermal shock. Surface porosity also made cleaning of the filters difficult because of their
tendency to “blind.”
Now, with advances in ceramic technology, these limitations have been overcome.
The filter tubes in the Tri-Mer UltraTemp Filtration system are manufactured from a new
generation of low-density ceramic fibers that provide exceptionally high resistance to
thermal shock. This makes the filters very ductile and resistant to crack formation.
Micrograph of filter elements composition (left). Characteristics of the fibrous ceramic filter elements (right).
Other unique properties of the fibers give the UltraTemp filters an exceptional ability to capture
fine particulate at the surface, without blinding. This makes them easy to clean using standard
pulse-jet techniques. Being fibrous, rather than granular, the filter elements are also lightweight,
and have a low resistance to flow, which minimizes the number of elements required for a
given application.
Contrast between types of ceramic filter elements. UltraTemp low-density filter tubes reflect
a new generation of ceramic technology.
PARTICULATE CAPTURE
While still achieving outlet levels below 0.001 grams/dscf, the UltraTemp Filtration is compatible
with heavy inlet loadings. Often above 1 grain/dscf (2288 mg/Nm3), certain applications are
three or four times this amount at the inlet. The ceramic filters are almost completely chemically
inert and highly corrosion-resistant.
1. Diameter of median size particle
SO2 AND ACID GAS CONTROL, MERCURY OPTION
The Tri-Mer UltraTemp Filtration system features an option for dry injection of calcium or
sodium-based sorbents for the capture of acid gases. Sodium bicarbonate and trona are typical
sorbents. Injected in the duct upstream of the filter modules, the additional sorbent particulate is
easily captured along with its pollutant gas. For these applications, SO2 removal is typically 90%
or better, with removal efficiencies as high as 97%. HCl removal is typically 95%, and often as
high as 99%. Mercury removal is an option using activated carbon or newer high-temp Hg sorbents.
Tri-Mer supplies and installs the complete system and all components.
- Operating temperature must be kept within 350°F - 1000°F for SO2 removal.
Sorbent injection prior to UltraTemp Filtration system for acid gas removal.
HIGH NOx CONTROL, EFFECTIVE ON DIOXIN
Of course, the UltraTemp system can be operated as a Selective Non-Catalytic Reduction
device (SNCR) using standard filters and upstream urea injection. Removal efficiency is limited
to about 30% and operating temperatures must be kept below 900°F.
If the need is for high NOx or dioxin removal, UltraTemp filter elements are available with
nanobits of SCR catalyst embedded in the walls of the filters. The filter walls are almost 1 inch
thick and contain the catalyst. Urea or ammonia is injected upstream of the filters. The catalyst
embedded in the filters then destroys the NOx with up to 95% removal efficiency. Note the lower
operating temperature required for high NOx destruction, 350°F to 400°F compared to 600°F to
650°F for conventional SCR. The reason is the increased reactivity of the nano-bits of embedded
catalyst that are almost completely protected from catalyst poisons such as PM and sulfur.
UltraTemp Filtration can incorporateboth sorbent injection for SO2 and catalytic reduction for
NOx in a single system can be removed along with PM in a single system. Dioxin removal is
also exceptionally high, generally over 99%. Tri-Mer supplies and installs the complete
system and all components.
- Operating temperature for high NOx removal must be kept:
350°F to 700°F for NOx removal up to 95%
UltraTemp Filtration system for control of particulate, SO2 and NOx.
Structure of ceramic filter element and micrograph of embedded catalyst
Source: Glass International Magazine, February 2008.
An application such as glass furnace exhaust illustrates the control of
PM, SO2, HCl, and NOx in a single system.
OPERATION OF THE ULTRATEMP FILTRATION SYSTEM
Tri-Mer’s UltraTemp Hot Gas Filtration system uses a baghouse configuration with a reverse
pulse-jet cleaning action. The filters are back-flushed with air, inert gas, syngas, or other
appropriate gases. It has a reliable sealing mechanism that is easy to access, and the design
has been engineered for easy installation and maintenance. Filter elements are manufactured
in various sizes, the largest of which is ten feet long and six inches in diameter, including an
integral mounting flange.
- Pressure drop across the system is approximately 8 inches w.g.
(Above left) Reverse pulse jet cleaning mechanism for the filter tubes. Filter tube wall
7/8" thick. NOx control option includes catalyst embedded in tube wall.
(Above right) Filter element housing module of the Tri-Mer UltraTemp Filtration system.
The UltraTemp Filtration system is an efficient, cost-effective approach for hot gas filtration.
With over 400 applications worldwide that utilize the fibrous ceramic filter elements, this
proven technology is now commercially available throughout the US, with full technical
and start-up support.
ULTRATEMP FILTRATION SYSTEM
Filter configuration typical of the
400+ filter applications worldwide
Recent advancements in fiber and ceramic technology have led to the implementation
of UltraTemp filtration, the hot gas filtration system that provides exceptionally versatile and
efficient emissions control for processes as diverse as syngas cleaning, glass production,
waste incineration, the production of metal powders, and boiler MACT compliance.
Primary Applications
- Boiler MACT compliance for coal, biomass, wood
- Syngas cleaning
- Glass furnaces
- Waste Incineration
- Waste pyrolysis
- Metal smelting, mineral processing
- Chemical production
- Many specialized high temperature applications
Waste incineration facility incorporating new ceramic filter elements.
More Applications
Air Pollution Control
- Cement production
- Medical waste
- Soil cleaning
- Foundry processes
- Fluidized beds
- Energy production
- Fire testing
Product Collection / Recovery
- Titanium dioxide production
- Fumed silica production
- Carbon black production
- Catalyst manufacturing
- Platinum smelting
- Metal powder production
- Activated carbon production
Tri-Mer Corporation, a technology leader in air pollution control, is the exclusive
manufacturer of the UltraTemp Filtration system, and provides turnkey engineering,
manufacturing, installation, and service through its Michigan facility.
For more information, please contact:
Kevin Moss
Tri-Mer Business Development Director
Advanced Technologies
Office/cell: (801) 294-5422
kevin.moss@tri-mer.com
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Phone: (989) 723-7838 • Fax: (989) 723-7844
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