Tkachenko A.E. , pupil, Gavrilenko B.V. , Ph.D. , Ass.Prof.

Donetsk national proficient university

One of the most existent job of power technology presents is the job of rational usage of energetic resources of our planet. It includes hunt of alternate heat-carrying agents and besides the development of new more effectual methods of development of bing 1s. The solution of this job is really of import because of critical state of affairs in fuel & A ; energetic industry of Ukraine. The cause of such unfavourable conditions is the shortage of all sorts of fuel, great lessening of the coal production volume and indispensable impairment of the quality of extract coal for the last 20 old ages ( ash content of coal run up to 35 % ) .

The solution of this job is necessary to look for in affecting into industry development new power resources, which have non been accounted in fuel and energy balance of the state until now and besides the development oh the methods of development fuel resources allowing perfectly usage of their heat potency and do the loss of energy lower limit. One of the manner to work out this job is the installing of the new combustion solid fuel engineerings by different derived functions of fluidized bed. One of the first topographic point takes the firing solid fuel engineering of the low-temperature fluidized bed.

Thankss to installing of this engineering it becomes possible to utilize the supply of low-quality solid fuel, use of the wastes of coal excavation and separation. It is possible to fire coal of 70 % ash content in this manner. And the mean mechanical waste of coal makes up merely 2-3 % under 40 % of firing coal in usual grate-fired furnace.

The particular characteristic of this engineering is that coal is in air-fluidized bed status during firing procedure. It is achieved by blowing air into the funace with the velocity which provides suspended status of the coal atoms. It facilitates the O admittance to them and makes the firing procedure more effectual. Th

vitamin E bed temperature must be between 750 and 850 0C to avoid coal slagging and clinkering. We can utilize raking off the scoria because the ash atoms settle-down. The solid fuel provender procedure is uninterrupted and fuel ingestion depends on the bed temperature value. Head emanation is achieved by embedded heat surface.

To supply optimal quality index of firing procedure it is necessary to accomplish high quality of the controlled procedure. The perfectly control of solid fuel firing procedure continuing becomes possible with the usage of automatic control system of low-temperature fluidized bed. It makes possible to supply necessary heat quality indexes, support technological quality indexes on optimum degree and as a consequence addition the capacity and effeciency and recognize exigency control. We can accomplish necessary control quality merely with the manner of complex technological parametric quantities province control in the low-temperature fluidized bed furnace. Following this single parametric quantity control ( e. g. temperature control ) must be realized merely with the history of the values of all another parametric quantities and on the base of their province analysis make the determination about farther combustion procedure control. We offer automatic temperature and fuel ingestion control system for low-temperature fluidized bed. It makes possible to keep the chief technological parametric quantity & # 8211 ; temperature on the order degree with the manner of solid fuel ingestion ordinance depends of the temperature value.

It allows to keep the high heat emanation degree, prevent damade working conditions connected with coal slogging and clinkering, supply optimum fuel ingestion. It well decreases coal losingss and increases the coal usage economical consequence.

So we can see that the usage of the new coal air-fluidized bed engineerings with automatic control system development let to work out the job of heating resources shortage. And the industry installing of the air-fluidized bed furnace makes the great economical consequence ( the twelvemonth drumhead economic system of the 30 air-fluidized bed furnaces is more so 5 million grn ) .