US: KHD Humboldt Wedag International AG's Americas Customer Service Centre has signed a contract with Holcim (US) for engineering, delivery of equipment, and site services to modify the existing production line at its Hagerstown, Maryland cement plant. The contract, which includes a KHD designed PyroProcessing System, will increase the line's production rate to 2400t/day and be compliant with the new NESHAP environmental regulations.

The project incorporates constructing a five-stage single-string KHD LowNO_x Preheater over the existing kiln, while the kiln is in operation. Additionally, KHD will modify the existing six-pier rotary kiln to a two-pier kiln and add a new KHD PYROFLOOR clinker cooler. The existing kiln will be cut to achieve a final length of 51m, transforming the existing long dry kiln system into a new, modern, energy efficient, fuel efficient, and environmentally friendly PyroProcessing system. The new system will be supplied with a new whole tire handling system and will be capable of co-processing up to approximately 7% of whole tires as an alternative fuel.

To reduce SO_x emissions KHD will supply a dry lime injection system. To reduce NO_x emissions KHD will supply PYROJET LowNO_x burners, a PYROCLON® Low NOX calciner with PYROLOOP® and a modification of the existing SNCR system. New dust collectors will be supplied to meet stringent particulate emissions requirements.

KHD's scope of supply for the project starts with a modification to the raw material feed system and ends with the clinker handling system into the existing clinker storage hall. The scope consists of all electrical and auxiliary equipment, a new raw material grinding VRM system, coal dosing systems, as well as civil and structural engineering and the supply of structural steel.

Commissioning of this new system is planned for mid-2016.