Jytte Boll Illerup

High-temperature reaction between sulfur dioxide and limestone—VI. The influence of high pressure

Abstract The influence of total pressures and partial pressures of carbon dioxide on the reaction between SO 2 and large particles of limestone was studied. The experiments were conducted in a laboratory fixed-bed reactor made of quartz at temperatures up to 950°C, total pressures up to 10 bar, and carbon dioxide partial pressures up to 2 bar. Two types of limestone were tested. At carbon dioxide partial pressures exceeding the calcination equilibrium pressure of limestone, the ultimate degree of sulfation was significantly lower at 850°C than at 750°C, most probably due to sintering of the calcium carbonate. Partly sulfated particles were less sensitive to heat treatment than unreacted and uncalcined limestone. Under calcined conditions, a considerable increase in the ultimate degree of sulfation at 850°C was observed with both types of limestone. A part of the explanation may be the high melting point of CaO compared to CaCO 3 , resulting in a much slower sintering rate. At 950°C the limestone calcines in the pressure range studied and a relatively high ultimate degree of sulfation was achieved.

Characterization of a full-scale, single-burner pulverized coal boiler: temperatures, gas concentrations and nitrogen oxides

Abstract Local temperatures and gas concentrations were measured in a 17 MW top-fired pulverized coal furnace. A specially designed suction pyrometer was used for thermocouple temperature measurements as well as withdrawal of gas samples from the furnace. The gas sampling system was carefully tested to make sure that the sample gas was efficiently quenched. Gas samples were analysed for O 2 , CO, CO 2 , NO, NO 2 and SO 2 . The effects of furnace load, primary:secondary air ratio and total excess air level were investigated. NO emission increased with the total excess air level, but was less sensitive to variations in load and in distribution of combustion air. These results are discussed in terms of NO formation mechanisms as well as burner and furnace characteristics. The experimental data provide good possibilities for scaling and modelling studies, in that they characterize a full-scale, single-burner pulverized coal system with a simple geometry.

Intelligent Heat System - High-Energy Efficient Wood Stoves with Low Emissions. Field Tests

Tests DTU Orbit (01/01/2019) Intelligent Heat System High-Energy Efficient Wood Stoves with Low Emissions. Field Tests Wood stoves have the potential of providing CO2-neutral energy without transmission loss—but with the significant drawbacks of high emissions of pollutants and particulate matter at low altitude close to private homes, and with an uneven heat release profile which produces non-optimal heating comfort. A collaboration project between the CHEC research centre at DTU Chemical Engineering and the stove manufacturing company HWAM A/S has led to development of an automatic control system for wood stoves, and the first version of an automatically controlled wood stove was launched on the market in 2012. The automatic control system developed for wood stoves in this project ensures optimal combustion conditions, thereby minimizing the emissions throughout a complete wood log combustion cycle. This improved performance has been verified by field tests in private homes.