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  4. 2020
  5. VOL 42, NO 6 (2020)
  6. pp. 72-90

INVESTIGATION OF CO-FIRING FOR FUEL DERIVED FROM MUNICIPAL SOLID WASTE IN A MODEL COMBUSTION CHAMBER

S.H. Kobzar, O.I. Topal, L.S. Haponych., I.L. Holenko

Èlektron. model. 2020, 42(6):72-90
https://doi.org/10.15407/emodel.42.06.072

ABSTRACT

The production and utilization of fuel derived from municipal solid waste (RDF/SFR) represents a method of the saving of organic fuel and decrease in the emission of harmful substances and greenhouse gases at landfill and refuse dumps. Ukraine has a potential for the production of 1.5–2 million tons of RDF/SFR with a calorific value of 10–25 MJ/kg annually. In the case of involving these fuels to power sector, it is possible to obtain about 1500 GW-h of electricity and 3000 GW-h of heat annually. The potential to substitute natural gas is estimated to be more than 0.6 billion nm3 annually. One of the promising variants to involve RDF/SFR to power sector is their combustion, including co-firing with natural gas, aimed at production of heat and electricity, in particular on the existing boilers of small and middle steam capacity while meeting rigorous ecological requirements (Directive EU 2010/75 etc.). Such co-firing could be made in the case of the above boiler modernization. For performing this investigation, we chose a gas-and-oil-fired burner GMP-16, mounted into a cylindrical combustion chamber. The gas-and-oil-fired hot-water boilers of grade KVGM, designed for heating and hot water supply, are equipped with burners of this type. In computer modeling, we determined the influence of addition of RDF on the process of their co-firing with natural gas for a given geometry of an element of the combustion chamber (with a burner of heat output 18.6 MW). We obtained calculated dependences of temperatures, velocities, distributions of gas components concentrations, carbon remained in the solid phase, as well as the concentrations of nitrogen oxides and carbon monoxide over the combustion chamber. According to preliminary assessments, we established a possibility of the addition of part of RDF about 20% (by heat at input) in their co-firing with natural gas, which will not change substantially the technical and ecological parameters of the work of combustion chamber.

KEYWORDS

waste to energy, fuel derived from municipal solid waste, computer modeling, combustion, nitrogen oxides.

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