Cleco Power seeking approval for 40-MW project powered by recovered heat

Cleco Power LLC is pursuing an approval at the Louisiana Public Service Commission for a certificate of public convenience and necessity to construct, own, and operate a 40-MW heat-recovery generation facility.

The application was filed on March 24 and the case is coming up for hearing at the commission on Aug. 19.

The project includes a waste heat recovery steam generator, steam turbine generator, and ancillary balance of plant equipment utilized in a waste heat recovery project (called the “WHR Project”) at Cabot Corp.’s Canal carbon black manufacturing plant. This project would generate renewable power. Additionally, Cleco Power is requesting LPSC authorization of its participation in the associated Waste Heat Purchase and Sale Agreement (PSA), under which Cabot will sell and Cleco Power will purchase waste heat generated from Cabot’s carbon black manufacturing process at the Cabot Facility.

The WHR Project is located adjacent to the Cabot Facility in St. Mary Parish at Franklin, La. The heat recovery steam generator will utilize the waste heat to produce the steam necessary to drive the steam turbine generator and generate electricity. The heat recovery steam generator will contain a selective catalytic reduction system to control NOx emissions, which Cabot will design, build, own, operate, and maintain. Cabot will also design, build, own, operate, and maintain a flue gas de-sulfurization system and a stack to be located immediately downstream of the heat recovery steam generator.

The PSA will specify an initial contract term of 20 years, with an automatic extension of 10 years.

The WHR Project will consist of one single-casing, multi-stage, dual extraction, condensing steam turbine generator; one single-pressure HRSG; one surface condenser; one two-cell cooling tower; deaerator; feedwater heater; pumps and balance of plant (BOP) equipment.. The exhaust gas feeding the HRSG will come from a new outlet at the Cabot Facility incinerator and will be located on the opposite side of the current outlet exiting to the stack. The exhaust gases from the dryers will combine with the exhaust gas from the incinerator, prior to entering the HRSG.

To reduce interruptions to the carbon black manufacturing process, the WHR Project will be designed with a full turbine bypass feature to allow the exhaust gas heat to still be recovered in the HRSG during steam turbine trips.

The flue gases from the HRSG will be treated for emissions compliance by Cabot in a separate project under a consent decree between Cabot and the U.S. Environmental Protection Agency. Cleco Power’s project scope for the WHR Project, however, will terminate at the outlet of the HRSG.

Major equipment purchasing and detailed design is expected to occur in late 2015, with construction commencing in late 2016 and continuing into the fourth quarter 2017. The deadline for commercial operation of the WHR Project is tied to Cabot’s EPA consent decree deadline of March 2018, and commercial operation is anticipated to occur in October 2017. The capital cost estimates for the project were developed jointly by Cleco Power and Amec Foster Wheeler, Cleco Power’s outside consultant for the WHR Project.

Carbon black is produced by a partial combustion method using hydrocarbons such as oil or natural gas as raw material. It is composed of fine particles consisting mainly of carbon, but the characteristics of carbon black vary depending on the manufacturing process. Carbon black is widely used in various applications, such as black coloring pigment of printing inks, resin coloring, paints, toners, and electric conductive agents found in high-technology equipment. A lot of carbon black is used in tires as rubber reinforcement.

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.