PRODUCTION • PROCESSING • HANDLING
SOLUTION to reduce engine emissions
Frank Griffin reports on using selective catalytic reduction to meet Tier 4 Final emissions regulations
Protection Agency (EPA) 2015 Tier 4 Final non- road regulations govern every engine for mobile off-highway applications. Tier 4 Final regulations reduce particulate matter (PM) by 80% and oxides of nitrogen (NOx) by 45% vs Tier 2 regulations. Cummins powered the first Tier 4 Final complete fracturing spread at a Pennsylvania airport project. As the first engine manufacturer to certify Tier 4 Final engines for the oil and gas market, the company is committed to providing its customers with the right solution. Tere are various technology paths that can be used to meet Tier 4 Final emissions. Not all of these solutions help Cummins address the key concerns of the firm’s customers in the field. Tese concerns are: that technology must be simple to install; it must work for worldwide business; no major redesign of equipment should be necessary – maintain the same footprint, space claim and heat rejection as prior product; maintain or improve power and performance; improve fuel efficiency; and finally, maintain or improve durability and reliability of the solution. To best address the core needs of its customers,
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Cummins has implemented the selective catalytic reduction (SCR) aftertreatment solution for its engines <751hp operating in the oil and gas field. Its broad experience with various aftermarket solutions has demonstrated that SCR aftertreatment is an ideal solution to meet the customer requirements for power, performance, reliability, durability, safety, ease of installation, and operational costs. SCR is a scalable, modular and maintenance
free aftertreatment that reduces NOx emissions present in engine exhaust. In step 1, engine exhaust containing NOx enters the SCR system. In step 2, the integrated ECM-controlled diesel exhaust fluid (DEF) doser injects the precise amount of DEF in a high efficiency spray pattern into the exhaust flowing into the decomposition chamber. In step 3, DEF atomises and quickly decomposes in the hot exhaust gas. Te result is ammonia and water vapour. In step
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he oil and gas industry has entered a phase where efficient, reliable and clean solutions for energy generation are more important than ever. In North America, US Environmental
4, ammonia and water vapour initiate a catalytic reaction, in which NOx is reduced to harmless inert gas. In step 5, clean exhaust of nitrogen gas, Co2
water vapour is emitted. and
Cummins engines >751 hp for oil and gas applications do not require a diesel particulate filter (DPF), diesel oxidation catalyst (DOC) or any form of regeneration with the Tier 4 Final SCR solution. On Cummins engines, improved combustion technology allows control of PM in the engine while SCR reduces NOx emissions in the exhaust. Tis delivers reductions in fuel consumption of 2-5% when compared with Tier 2 products while package size remains comparable. Additionally SCR is a ‘fit and forget’ system, designed to meet the engine’s life-to-overhaul with minimal maintenance
Skidded bulk DEF system that includes two 1,200 US gallon DEF tanks and one pumping cabinet
Cummins Tier 4 Final certified QSK50-DPM 1MW Drilling Genset
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