Method of optimizing combustion and the capture of pollutants du

Details Method of optimizing combustion and the capture of pollutants du Method of optimizing combustion and the capture of pollutants du

1986-02-26

1988-08-23

Yuen, Henry C.

Furnaces

Process

Burning pulverized fuel

110245, 110264, 110266, F23D 102

Patent

active

047652586

ABSTRACT:
Coal combustion and the capture of pollutants are optimized by a method which applies two mechanisms for sulphur capture, one in which pulverized coal particles suspended in the gas stream in the injection zone of the combustor are affected by reaction with a suspended sorbent, and another in which the particles are reentrained in the gas stream by a "sand storm" effect near the wall of the combustor. Use of the two mechanisms results, in commercial scale cyclone combustors, in 70 to 90% sulphur capture at economical Ca/S ratios. The method also minimizes emission of ash by removal from the pulverized coal fuel particles too small to be retained in the combustor and too large to be completely burned in the combustor, minimizes reevolution of sulphur compounds from slag by rapid and continuous removal of slag from the combustor, minimizes emission of NO.sub.x pollutants by maintaining a favorable overall fuel-rich stoichiometry.

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