Оценка энергетического потенциала свалочного газа

Abstract

The purpose of the work was to compare the potential of biogas generation at MSW landfills, determined by the most commonly used methods, and to determine the energy potential of landfill gas in the country's energy system, provided that it is fully used to generate electricity. Based on the equation of the chemical reaction of biogas formation, equations are proposed for calculating the specific yield of biogas components from 1 kg of waste and their shares in volume percent. Calculations according to the proposed formulas showed that the yield of biogas from a ton of waste for Russian MSW, the composition of which is accepted from different sources, varies significantly, from 312 to 433 m3. The composition of biogas changes little, and the theoretical content of methane in it ranges from 53% to 57%. The yield and composition of biogas was estimated using the Tabasaran-Rettenberger equation, LandGEM, DOD (IPCC), CLEEN models and Russian regulatory methods. The average total biogas yield was 195 m3/t waste with a variation coefficient of 38%, the average methane yield was 95 m3/t waste with a variation coefficient of 46%, and the average calorific value of biogas, related to 1 ton of waste from which it was formed, was 3 400 MJ/t of waste with a coefficient of variation of 44%. With a conversion efficiency of 39%, landfill gas from 1 ton of waste can generate 368 kWh of electricity. The total volume of municipal solid waste in Russia, subject to the full collection and use of biogas, makes it possible to generate 22.1 billion kWh of electricity, which is about 2% of the total energy consumption in the country. For a number of countries, the energy potential of landfill gas ranged from 0.05% (China) to 4.5% (Spain). Thus, landfill gas is a significant source of electricity in the overall energy balance.