Parallel flow regenerative lime kiln and method for the operation thereof

摘要

The method according to the invention for operating a PFR lime kiln having at least two shafts, which each have a preheating zone, a combustion zone and a cooling zone, and an overflow channel which connects the two shafts, substantially comprises the following method steps:
the two shafts are operated alternately as a combustion shaft and exhaust gas shaft,combustion air and fuel are supplied to the combustion shaft, a corresponding flame length being formed, andthe hot gases which are produced in the combustion shaft reach the exhaust gas shaft via the overflow channel,at least one parameter of the hot gases which is characteristic of the formation of the flame length being established by means of direct or indirect measurement in the region of the overflow channel and the ratio of fuel to combustion air being adjusted in accordance with this parameter in order to adjust a predetermined flame length.

主权项

1. Method for operating a parallel flow regenerative lime kiln having at least two shafts, which each have a preheating zone, a combustion zone and a cooling zone, and an overflow channel which connects the two shafts, having the following method steps:
the two shafts are operated alternately as a combustion shaft and exhaust gas shaft, combustion air and fuel are supplied to the combustion shaft, a corresponding flame length being formed, and the hot gases which are produced in the combustion shaft reach the exhaust gas shaft via the overflow channel, characterised in that at least one parameter of the hot gases which is characteristic of the formation of the flame length is established by means of direct or indirect measurement in the region of the overflow channel and the ratio of fuel to combustion air is adjusted in accordance with this parameter in order to adjust a predetermined flame length, characterised in that, in order to adjust the flame length in the combustion shaft, the following method steps are carried out: a. establishing the mean value of the temperature of the hot gases in the overflow channel, b. establishing the mean value of the minimum temperatures of the hot gases in the overflow channel, c. calculating the difference (ΔT) of the two mean values, d. comparing the difference with an adjustable desired value and adjusting the quantity of combustion air to be supplied in accordance with the comparison result.