E. A. Pitsukha

Burning of solid biofuels in a cyclone-bed furnace chamber

Burning of solid biofuels (wood chips, milled peat, crushed peat bricks) in a cyclone-bed furnace of an air-heater boiler with power of 16.5 kW is investigated experimentally. It is established that the radial temperature distribution in a burning chamber is characterized by considerable nonisothermicity, which somewhat decreases as the amount of small fractions in the fuel increases. The influence of the air excess coefficient on the CO and NO concentrations in exhaust flue gases is shown. The dependence of the NO concentration on the air excess coefficient has the extremum in the studied range of experimental conditions. The comparison of established concentrations of CO and NO with regulations shows that when burning the wood fuel and peat brick according to the cyclone-bed technology, the air excess at the furnace output can be lowered to 1.07 (depending on the boiler aggregate power) simultaneously attaining the limiting CO concen tration, which makes it possible to increase the boiler efficiency compared with efficiency of boilers with bed furnaces (air excess coefficient of 1.3–1.6) by 2–4%.