NDLI: Successful Implementation of Methanol Firing at 50 MW Gas Turbine for Long Term Operation

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chudnovsky, B. Reshef, M. Keren, M. Baitel, S.
Copyright Year	2015
Abstract	Recently methanol’s use as a fuel is becoming more attractive. Firstly, because of the prices of NG (the main feedstock for methanol production) are now at record low. This has prompted consideration of other alternative energy sources that are not oil dependent. A second key issue has been growing global concern for environment and emphasis being placed on the use of fuels with lower SO2, NOx and particulates emissions. Methanol offers these advantages, being a derivative of natural gas which partly de-linked from oil, and is a clean burning fuel. In this manner full scale test of methanol firing at FT4C TWIN PAC 50 MWe GT designed by Pratt & Whitney was performed. The obtained results clearly show that with minor low cost fuel system retrofit methanol firing leads to significant NOx, SO2 and particulates emission reduction. NOx emissions were reduced by more than 75% and are equal 75 mg/dNm3 at 15%O2. It is less then required standard even with water injection operation mode (the standard is 86 mg/dNm3 at 15%O2 of NOx emission). SO2 emissions were reduced to zero with methanol firing. Particulate emissions vary from 1.3 to 1.6 mg/dNm3 at 15% O2 with methanol firing, while with LFO this parameter was 13–37 mg/dNm3 at 15% O2. However, it should be noted that methanol has a significantly lower calorific value, which is, for example, half of diesel oil and requires therefore some specific modification in gas turbine equipment. First, the existing fuel nozzles are too small for the higher volumetric methanol flow and should be replaced by high flow fuel nozzles. The existing fuel supplying pump should also be upgraded to the higher methanol flow. Modulating valve was also replaced due to the same reason. The paper first gives an overview of some of the key technical considerations of the gas turbine conversion from diesel oil to methanol firing, and results of long term operation of gas turbine fired by methanol. Based on the obtained results one may conclude that methanol is an attractive alternative fuel for meeting the energy needs of niche markets in an economic and environmentally sustainable manner, utilizing existing and/or new power generation units.
Sponsorship	Power Division
File Format	PDF
ISBN	9780791856604
DOI	10.1115/POWER2015-49779
Volume Number	ASME 2015 Power Conference
Conference Proceedings	ASME 2015 Power Conference collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum
Language	English
Publisher Date	2015-06-28
Publisher Place	San Diego, California, USA
Access Restriction	Subscribed
Subject Keyword	Firing Valves Combustion Feedstock Fuels Flow (dynamics) Emissions Fuel systems Gas turbines Renewable energy Pumps Particulate matter Sustainability Energy generation Nitrogen oxides Nozzles Diesel Underground injection Natural gas Methanol
Content Type	Text
Resource Type	Article

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