Tri-mer’s UltraTemp Filtration for hot gases, PM, SOx and NOx , is a highly efficient particulate reduction technology and is an excellent way to achieve boiler emissions compliance.  It is also the ideal solution for the treatment of incinerator emissions.  It provides optimal filtration for gases 200 to 500°C and can often be applied to gas streams up to an operating temperature of 900°C. A new generation of fibre-based ceramic filter is the basis of the technology.

The UltraTemp Filter achieves high collection efficiencies for particles in the submicron or ultrafine range.  Typical PM outlet results of below 2 mg/Nm³ can be achieved.

For acid gas removal, the system incorporates dry sorbent injection for very efficient dry scrubbing of SO₂, HCl, and other acid gases. Typical SO₂ removal efficiencies are 90-97%.

Another option is the 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 removal efficiencies are up to 95%.

Primary applications of the Tri-Mer UltraTemp Filtration system include:

• boiler emissions compliance (coal, biomass or wood-fired boilers)
• syngas cleaning
• glass production
• waste incineration
• biomass pyrolysis
• metal smelting
• mineral processing
• chemical production
• many specialized high temperature applications

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.

Other unique properties of the fibres 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.

Particulate Capture

While still achieving outlet levels below 2 mg/Nm³, the UltraTemp Filtration is compatible with heavy inlet loadings.  The ceramic filters are almost completely chemically inert and highly corrosion-resistant.

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 SO₂ removal, operating temperatures must be kept within 180 and 540°C.  Removal efficiencies for SO₂ are typically 90% or better.

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.

Scion Technologies supplies and installs the complete system and all components.

High NOx Control, Effective on Dioxin

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 there is a need for high NOx or dioxin removal, UltraTemp filter elements are available with nanobits of SCR catalyst embedded in the walls of the filters. Urea or ammonia is then injected upstream of the filters. The catalyst embedded in the filters destroys the NOx with up to 95% removal efficiency.  Note that the lower operating temperature required for high NOx destruction is 180 to 200°C compared to 315 to 340°C for most conventional SCR processes. The reason for this is the increased reactivity of the nano-bits of embedded catalyst, which are almost completely protected from catalyst poisons such as PM and sulphur.

UltraTemp Filtration can incorporate both sorbent injection for SO₂ removal and catalytic reduction for NOx in a single system, which can be removed along with PM in a single system. Dioxin removal is also exceptionally high, generally over 99%. Scion Technologies supplies and installs the complete system and all components.