Near-stoichiometric burner adjustment saves energy costs

Near-stoichiometric burner adjustment saves energy costs and reduces metal oxidation.

An optimum air-to-fuel ratio means optimum results: this is true for all combustion processes. It’s also the reason why, as of today, StrikoWestofen is offering foundry customers the option of near-stoichiometric burner adjustment. The setting has to be made only once, when the “StrikoMelter” melting furnace is commissioned, and will then ensure the correct ratio of air and fuel at all times. This not only minimizes energy consumption, it also reduces metal oxidation. As a result, the investment quickly pays for itself.

In everyday foundry operations, excess air is often the culprit behind increased energy use of melting furnaces. “If you don’t keep an eye on air-fuel ratios, you are literally burning money,” says Rudolf Hillen, burner expert at StrikoWestofen. That’s why they now offer an economical method of near-stoichiometric burner adjustment.

At a combustion air ratio (λ) of 1, the oxygen in the air reacts completely with the fuel gas. While gas flow is easily measured via a meter, measuring the amount of air requires more complex equipment and can cause a steady loss of pressure in the combustion air system.

“This is why we are now offering our customers a solution for which we only have to measure air flow once, during the commissioning of the furnace,” Rudolf Hillen explains. “To do this, we install a measuring section in front of the combustion air fan. The pressure drop at the standardised metering orifice is an exact measure of the air flow.” With the help of special software, the air vent of the burner can then be positioned precisely to produce an optimum combustion air ratio λ of near 1.

The thus minimised excess air in the combustion process also reduces oxidation during the melting process in the furnace. Suitably adjusted burners ensure a high flame temperature and optimum heat transfer to the metal to be melted, saving energy and costs.

“We are talking about approximately seven kilowatt hours less energy per tonne of metal, i.e. annual savings of around 2.500 euros. In other words, at a melting rate of two tons per hour, the additional one-off investment pays for itself within two years,” Hillen adds.

From 2018, near-stoichiometric burner adjustment will be included in the scope of delivery for the standard version of StrikoMelter models PurEfficiency and BigStruc. It is available as an option for all other StrikoMelters.

Posted by 뜨락 뜨락(Countrylife4u)

Jensen’s Proven Workboat Design Selected for NAVSEA New-Build

Jensen Maritime Consultants, a Crowley company, announced today that one of its proven workboat designs will be used by a Pacific Northwest boat builder to fulfill a construction project for the Naval Sea Systems Command (NAVSEA). In support of the project, Jensen will supply a functional and regulatory design package for the 41-foot vessel, which will provide ship- and sub-assist services, as well as other port operational services at U.S. Navy port locations around the world.

“We are proud to have our highly functional, safe and efficient design selected for this new series of workboats,” said Jensen’s Bryan Nichols, director, business development. “We have worked closely with the build team to ensure maximum efficiency for vessel construction. Once completed, it will be a well-equipped, very maneuverable workhorse.”

The U.S. Navy will use the 22,000-pound bollard-pull workboat in locations around the world to primarily assist barges, submarines, and other naval vessels; open and close security barriers; and tow or push floating port operations support equipment. To support these missions, Jensen designed the vessel to include two Pullmaster hydraulic deck winches for use in multiple mooring configurations and heavy-duty fendering to offer optimal protection when performing such work. The push knees are also radiused toward the top for use when pushing against vessels with flare.

Unique to the workboat, which has a beam of 16 feet, 7 inches, is a removable cabin and push knees, which allow it to be transported over-the-road by truck. The propulsion system consists of ZF W325 marine gears and inboard diesel engines, Twin Cummins QSM11-455, which offer 450 BHP at 2,100 RPM.

Additionally, Jensen added highly functional features to the design, such as an H-bitt on the bow, mooring bitts at the shoulders and stern quarters, and an aft taffrail for a smooth sweep of the tow hawser while towing astern. The workboat also has a 500-pound capacity lifting davit that can be mounted in three different locations on the stern, kort nozzles and flanking rudders to improve steering when operating in reverse, and skegs for directional stability while underway and structural support to facilitate drydockings and transport.

Finally, the workboat offers a complete HVAC system and a 3,100-pound total payload, including up to five crewmembers, additional mission gear and cargo, and a six-person life raft. The boat has been designed to American Boat and Yacht Council (ABYC) standards and meets the U.S. Navy’s stability requirements, including damage stability. Delivery is expected in fall of 2018.

Posted by 뜨락 뜨락(Countrylife4u)

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