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The objective of this work is to investigate means of raising the flame temperature and emissivity of low calorific value fuel gas. An existing test furnace was modified to give an acceptable performance firing cold fuel gas (3.2 MJ/m(n)3); the maximum flame temperature was found to be about 1340 C. In general the most economic means of raising flame temperature was found to be by preheating combustion air (and/or fuel gas). Oxygen enrichment of the fluidising gas to raise fuel calorific value (up to 5.1 MJ/m(n)3) was found to be a more economic means of raising flame temperature than oxygen enriched combustion air. Use of minimally cleaned fuel gas (containing about 6 g/m(n)3 of dust) was found to raise emissivity to about 0.24 - 0.28 at a calorific value of 3.6 MJ/m(n)3. Emissivity was raised further (to values up to 0.44) by injection of a liquid additive or use of an elevated calorific value fuel. Below a flame temperature of 1550 C thermally generated NO(x) was negligible. A significant proportion of fuel bound nitrogen was converted into NO(x) on combustion, so when ammonia and dust were present in substantial quantities this effect outweighed thermal NO(x), giving emissions in the range 130-380 ppmv.

Additional information

Authors: BRITISH COAL CORPORATION, Coal Research Establishment, Cheltenham (GB)
Bibliographic Reference: EUR 12498 EN (1989) 42 pp., MF, ECU 4, blow-up copy ECU 5
Availability: (2)
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