Effects of S and Al on K Migration and Transformation during Coal and Biomass Co-combustion

Abstract

The co-combustion of biomass and coal has both environmental and economic benefits in terms of pollutants and greenhouse gas emissions. However, one of the key factors affecting the feasibility of this technology is the ash deposition and corrosion caused by the high alkali metal content of biomass, especially K. After the addition of elemental S to corn stalk/Xiaolongtan lignite blended fuel and Al 2 O 3 to corn stalk/Datong lignite, combustion experiments were carried out in a tubular furnace to explore the effects of S and Al in coal on K migration and transformation. The experimental results show that when S/K < 6, an increase in the S/K ratio inhibited the release of K. When S/K > 6, the sulfation become saturated, and an increase in S promoted the release of K. When S/K = 6, the higher the temperature was, and the more obvious the inhibitory effect on the release of K was. Increasing the S/K ratio not only increased the CaSO 4 content of the ash but also increased the content of water-soluble K compounds, such as K 2 SO 4 , and decreased the contents of acid-soluble K compounds and insoluble K compounds, such as KAlSi 3 O 8 . After Al 2 O 3 was added, as the Al/K ratio increased, the K release rate gradually decreased. When the sample with Al/K = 2.5 and the original samples were burned at 600–700 °C, the difference in the K release rates of the two samples was relatively small. When the temperature was higher than 700 °C, the higher the temperature was, and the greater the difference in the K release rates of the samples was, which indicates that a high temperature promotes the formation of aluminosilicates containing K.

Hydrogen, Ammonia and Symbiotic/Smart Fertilizer Production Using Renewable Feedstock and CO2 Utilization through Catalytic Processes and Nonthermal Plasma with Novel Catalysts and In Situ Reactive Separation: A Roadmap for Sustainable and Innovation-Based Technology

“…In the case of the down-draft fixed-bed gasifiers developed by the author, the existing syngas cleaning technology based on commercial Wet Electrostatic Precipitators (for tar and particulate removal) or direct syngas scrubbing were sufficient to produce electricity through gas engine generators at large scales (500 kWe-2 MWe) using various biomass feedstock [67,99,114]. However, further tar removal or conversion of tars to low molecular mass hydrocarbons is necessary for the conversion of syngas to liquid fuels or chemicals, including ammonia [3,74,[103][104][105][106][107][110][111][112][114][115][116][117][118][119][120][121][122][123][124].…”

Numerical Study on Combustion Characteristics of Biogas Cocombustion in a 300MW Coal-Fired Boiler Furnace

“…Among the adopted methods, the coupled combustion of biomass and coal has garnered considerable attention from researchers. This technology leverages the existing boilers and auxiliary systems in current coal-fired power plants, offering advantages such as lower initial costs, heightened efficiency in biomass power supply, and reduced CO 2 and NO x emissions by comparing with the traditional power generation methods. − Consequently, coupled biomass–coal power generation has emerged as an effective means of enhancing the utilization of biomass energy and curbing pollutant emissions in existing coal power plants . To reduce greenhouse gas emissions and increase the proportion of renewable energy use globally, cocombustion with biogas in the coal-fired boiler has been widely studied for power generation. , …”

Exploring CsPbX3 (X = Cl, Br, I) Perovskite Nanocrystals in Amorphous Oxide Glasses: Innovations in Fabrication and Applications

“…Such an advantageous property allows us to produce LHP NCs with a bright emission without the requirement of additional surface passivation (i.e., through deposition of wide‐bandgap semiconductor shells), which is otherwise a necessity for most of the conventional NCs such as CdSe, [ 16 ] Cu‐In‐S, [ 17 ] and InP (the PLQE of the bare InP NCs is typically 1%). [ 18 ] We also refer an interested reader to a recent comprehensive review on PeNCs. [ 19 ]…”