Texas readies air permit for gas turbines at LNG project

The Texas Commission on Environmental Quality on Dec. 29 issued a notice of plans to approve a greenhouse gas air permit for a liquefied natural gas (LNG) import/export project.

Corpus Christi Liquefaction LLC (CCL) proposes to construct and operate natural gas liquefaction and export plant and import facilities with regasification capabilities. The LNG terminal will be capable of processing an annual average of approximately 2.1 billion standard cubic feet per day of pipeline quality natural gas in the liquefaction mode and 400 million standard cubic feet per day in the vaporization mode.

The project will involve liquefying natural gas into LNG to be stored in three 160,000 cubic meters storage tanks. LNG will be imported or exported via LNG carriers that will arrive at the project’s marine terminal. The facility will have the capability to liquefy natural gas from the pipeline system for export as LNG or import LNG and regasify it to send it out into the pipeline system.

The LNG terminal will operate three trains continuously (8,760 hours per year) using eighteen General Electric LM2500+G4 SAC (with dry low NOx emissions) gas-fired refrigeration compressor turbines, six on each train. There are two methane, two ethylene, and two propane refrigeration turbines per train. Each of the three trains in the liquefaction process is to be equipped with an amine treatment system to remove acid gases such as hydrogen sulfide and carbon dioxide. Then, the gas is treated with a triazine-based process designed to remove to the extent practicable any remaining sulfur from the acid gas.

Said the notice: “This permit authorizes eighteen (18) GE LM2500+G4 SAC natural gas fired combustion turbines, or equivalent turbines that do not result in a change in application representations or permit conditions, Emission Point Nos. (EPNs) TRB1 through TRB18. If a turbine other than the GE LM2500+G4 SAC is constructed, the permit holder must alter this permit prior to start of construction demonstrating that the other turbine’s emissions are no greater than the allowable emissions in this condition or on the MAERT. If the other turbine is designed to emit less than the GE LM2500+G4 SAC, while operating in similar service, the permit may be altered to reflect lower emissions that are determined to be achievable.”

It added: “The standby generators (EPNs GEN1 through GEN 4) are limited to no more than 27 hours each of non-emergency operation per 12-month period. Each generator shall be equipped with a non-resettable elapsed run time meter.”

The facility is to be located off of State Highway 361, about 3 miles southeast of Gregory in San Patricio County, Texas.

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.