WASTE TO ENERGY
Mirek Spicar introduces a sophisticated tool for boiler cleaning based on a novel concept
ncineration of solid organic materials generates flue gas, fly ash and slag. Fine fly ash particles are entrained with the flue gas, whereas coarse
CLEANING I
BETTER BOILER
slag is removed at the discharge of the furnace. Fly ash and condensate, mostly metal salts, settle down on boiler surfaces, which hinders heat transfer through the tube wall to the water/steam cycle. All operators are faced with the problem of decreasing thermal efficiency of the boiler, caused by the settling down of fly ash, called fouling of the boiler.
THE IDEA Several methods of cleaning boiler surfaces are available, allowing cleaning of the heat transfer areas during boiler operation as well as during shutdown. Te widely applied cleaning by soot blowers lets the driving media (superheated steam or compressed air) act in a linear or oscillating manner. Te cleaning impact only reaches the areas of the direct media
46
www.engineerlive.com
jet. Additionally, a considerable amount of the valuable superheated steam is consumed, and abrasion/erosion is caused to the protective shells or to the boiler tubes themselves. Te idea of cleaning the boiler surfaces by using a spherical shock wave, which can remove fly ash deposits even from hidden surfaces, such as from rear sides of the boiler tubes, became the driving force for development of a compact and automated cleaning device at the turn of the century.
STEP-BY-STEP DEVELOPMENT Te predecessor of today’s shock pulse generators involved the local ignition of a controlled portion of explosives or a gas mixture. Te cleaning impact is sufficient for a certain time; however, the handling procedure requires strict safety precautions and specialist training for the operator. Te so-called “manual online cleaning methods” are based on opening one of the inspection doors of the boiler
during its operation and inserting a lance to the vicinity of the area to be cleaned. Te lance tip is equipped with the device set to explode following the operator’s initiation.
The new SPGr series installed and operational
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52
