The paper presents the results of experimental technical investigations to limit the mobility of chlorine released in the form of hydrogen chloride from the fuel in a stoker-fired boiler furnace. In the combustion process, hydrated lime was used as the bonding material. The background for the research was a lowchlorine-gram-fraction fuel, namely, extracted rapeseed meal supplemented with PVC recyclate granules to diversify the quantity of the quick-release chlorine. The research results indicate the tendency of changes of the hydrogen chloride concentration in the flue gas in relation to the amount of PVC added to the fuel, i.e., the gram fraction of chlorine and the amount of calcium hydroxide added to the fuel, as well as the Ca/Cl 2 molar ratio.

The paper presents results of experimental semi-technical investigations to limit the mobility of chlorine released in the form of hydrogen chloride from the fuel in the stoker-fired boiler furnace. In the combustion process, limestone and dolomite were used as the sorbents. The background for the research was a fuel containing a low gram fraction of chlorine, namely, extracted rapeseed meal supplemented with polyvinyl chloride (PVC) recyclate granules, to diversify the quantity of the quick-release chlorine. The research results indicate the tendency of changes of the hydrogen chloride concentration in the flue gas in relation to the amount of PVC added to the fuel, i.e., gram fraction of chlorine, amount of limestone and dolomite added to the fuel, as well as the molar ratio Ca/Cl2 or (Ca + Mg)/Cl2, respectively. It has been proven that the greatest dechlorination capacity is exhibited by hydrated lime, lesser by limestone, and the least by dolomite, which, nonetheless, can be used under certain conditions for HCl bonding in boiler furnaces.

The present study deals with the problem of limiting HCl mobility in processes of combustion of two solid recovered fuels (SRF1 and SRF2) having significant but different contents of chlorine. Large-scale experiments were carried out at a temperature of 1050 °C with the use of a stoker-fired flat grate boiler with the heat output of 1 MW, and with a two-stage combustion system for medical waste incineration (MWI) with the same heat output in which first the process of gasification in the temperature of 650 °C occurs, and subsequently the previously obtained syngas is fired in the temperature of 1000 °C in the reburning chamber of the gas generator. In such a way, two different technologies of combustion have been compared, with regard to HCl capture efficiency using widely available calcium hydroxide sorbent Ca(OH) 2 . In order to simulate the increased concentration of chlorine in SRF1, the fuel was being supplemented with three various additions of poly(vinyl chloride) (PVC) recyclate. Before combustion, SRF1 and SR2 were also blended with Ca(OH) 2 whose weight amount was being changed: from 0 to 3 wt % with a step equal to 0.5 wt % (combustion) and from 0 to 1.5 wt % with a step equal to 0.5 wt % (two-stage combustion). For both of the methods of SRFs combustion, series of experimental findings have been presented, showing trends in the changes of HCl concentration in flue gas, depending on (i) the amount of PVC recyclate added to SRF1 and amount of Ca(OH) 2 added to both fuels; and (ii) the molar ratio Ca/Cl 2 . Finally, the ratio of HCl concentrations in flue gas after combustion and two-stage combustion, depending on the amount of added PVC and Ca(OH) 2 to the fuels was analyzed. The achieved results indicate that in a two-stage process (gasification and recombustion), HCl can be much more effectively bonded than during combustion in stoker-fired boiler.

The paper presents laboratory research on a new manufacturing technology of high-methane synthesis gas from biofuels, such as pine wood biomass and post-extraction rapeseed meal. The study was conducted in the gasifier with a power of 5 kW. As a result, the content of CH 4 in the syngas is from 5 to approximately 15%. The calorific value of the syngas [lower heating value (LHV)], depending upon the content of the preparation in the fuel (0−30%), varied from 4 to 9 MJ/Nm 3 . Exothermic balance of the gasification process was established for the following technological parameters: temperature over the grate, T 1 = 800 °C, temperature in the fuel layer, T 2 = 450 °C, and temperature over the fuel layer, T 3 = 850 °C.

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