DIRECT AND INDIRECT THERMAL TREATMENT OF MSW WITH COUPLING TO PC BOILER UNIT

摘要

The paper concerns the problem of combustion and pyrolysis of MSW followed by introducing the product of thermal treatment into the conventional boiler fired with coal I.e. coupling of MSW incinerator or pyrolitic generator with PC boiler. Taking into account the amount and composition of municipal wastes the main components of waste were chosen for pyrolysis investigation and kinetic calculation. The investigation of wastes behavior during pyrolysis and behavior of waste chloro-micropollutants in isothermal flow reactor fired with lignite was carried out. The rate of selected samples pyrolysis and composition of pyrolytic gas and byproducts for various parameters of pyrolysis (temperature, atmosphere) in isothermal reactor was investigated. The kinetic of pyrolysis by TG method for: paper, plastic and organic waste at different content of moisture was estimated. Using the data from experiments, industrial boiler data the calculations of 200MWe boiler fired with lignite including the different contribution of waste flue gas and pyrolitic gas and byproducts (up to 10% vol. Of total flue gas in boiler) were carried out to estimate the effect of addition of waste gas on boiler's operational parameters. The introduction of waste flue gas or pyrolitic products into the boiler requires the solution of some problem as the reduction of chloro-micropollutants thus the evaluation of the waste gas way injection into the boiler. The feeding of waste flue gas into the boiler can reduce the investment and operational cost of MSW incineration. The results of experiments and calculations showed that waste flue gas and pyrolitic gas have negligible effect on boiler's combustion chamber parameters (composition of flue gas and outlet temperature). To maintain the outlet steam parameters the consumption of coal changes depending on the temperature and water content of waste flue gas.