Assessment of the Capability of Firing Clean Low BTU Gases in Existing Coal,Oil and Gas-Fired Steam Generators.

摘要

The objective of this study is to assess the capability of existing steam generating units in electric utility plants when firing low BTU gas (LBG). This includes: (1) determining the maximum generating capacity without making any modifications to existing pressure parts or auxiliary components; (2) establishing the minimum heating value of LBG that can be used to obtain original maximum continous rating; (3) defining the alterations and estimating the order of magnitude costs which are required to achieve original maximum continuous rating;and (4) providing performance data to make a comparative evaluation of LBG firing. This report includes an evaluation of five low BTU gases with higher heating values of 105BTU/SCF, 128BTU/SCF, 179BTU/SCF, 292BTU/SCF,and 396BTU/SCF. Six typical modern type steam generating units were randomly selected for study. They range in size from 250Mw to 900Mw,include both subcritical and supercritical pressure steam cycles,and have tangential firing systems to fire one of the predominant fossil fuels, i.e.,pulverized coal,fuel oil or natural gas.