Mechanical stokers with pneumomechanical spreaders and reverse motion chain grating are intended for fuel-bed firing of black and brown coals in steam and hot-water boilers the heat productivity of which is up to 58 MW as well as in furnaces.

The stokers work on the principle of a continuous spreading to the active bed, in combination with the slow reverse motion of the chain rippled grate it provides the low ignition throughout the whole grate and steady combustion. The characteristic feature of those stokers is a combination of mechanical, as the basic, and pneumatic spreading, which makes it possible to optimize combustion of dust fractions in the furnace volume. The stoker design automates combustion action.

TECHNICAL CHARACTERISTICS

The range of loading variations, % 25-100

Excess air factor behind the stoker, no more than 1.35-1.5

Heat losses caused by chemical underburning, %, no more than 0.5-1

Heat losses caused by mechanical underburning, %, no more than 8.0

Basic fuel: black and brown coals

Fuel humidity, %, up to 40

Fuel ash value, %, up to 35

Fine particles content (0-6 mm), %, up to 60

Maximum lump size, mm, up to 40

BASIC DESIGN PARAMETERS

Parameter Stoker type TЧЗ-2.7/5.6 TЧЗ-2-2.7/6.5 TЧЗ-2.7/8.0 TЧЗ-4.92/8.0 Length between the axes L, mm 5600 6500 8000 8000 Length L1, mm 7175 8075 9310 9775 Grate width В, mm 2700 2700 2700 4920 Height Н, mm 690 690 690 850 Height Н1, mm 3015 3015 3015 3175 Height Н2, mm 580 520 580 1015 Mass, kg 24400 26800 28850 63600