Search for dissertations about: "pulverized fuel combustion"

Showing result 1 - 5 of 17 swedish dissertations containing the words pulverized fuel combustion.

2. 1. Physical and numerical modelling of flow pattern and combustion process in pulverized fuel fired boiler

   Author : Jacek Baranski; KTH; []
   Keywords : combustion; air staging; fuel staging; boiler; computational fluid dynamics CFD ; pulverized fuel combustion; mathematical modelling; physical modelling; pollutants; numerical simulation;

   Abstract : This licentiate thesis describes development of modellingtools, experimental physical modelling and numerical modellingto simulate real combustion processes for advanced industrialutility boiler before and after retrofit.The work presents extended study about formation,destruction and control of pollutants, especially NOx, whichoccur during combustion process. READ MORE

4. 2. The Fate of Sulfur during Oxy-Fuel Combustion

   Author : Daniel Fleig; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pulverized coal combustion; oxy-coal; SO3; Oxy-fuel; SO2; sulfur;

   Abstract : Oxy-fuel combustion, where air is replaced by O2 and recycled flue-gas to enrich combustion products, is one of the main CO2 capture technologies suitable for large-scale coal-fired power plants. The changed combustion conditions in oxy-fuel combustion influences the sulfur chemistry, which has recently been the subject of increased attention due to the importance of sulfur species in corrosion and flue-gas cleaning issues. READ MORE

5. 3. Combustion and Nitrogen Chemistry in Oxy-Fuel Flames

   Author : Daniel Kuehnemuth; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nitric oxide; Gasification; Oxy-fuel; Reburning;

   Abstract : Oxy-fuel combustion is a Carbon Capture and Storage (CCS) technology that recently has shown afast progress towards the industrial scale application. In oxy-fuel combustion, oxygen instead of air isused as oxidizer to burn the fuel. The oxygen is mixed with recycled flue-gas in order to control theoverall combustion and heat transfer conditions. READ MORE

6. 4. Volumetric combustion of torrefied biomass for large percentage biomass co-firing up to 100% fuel switch

   Author : Jun Li; Weihong Yang; Günter Scheffknecht; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biomass; co-firing; torrefaction; torrefaction degree; kinetics; volumetric combustion; fuel switch;

   Abstract : The co-firing of biomass and coal plays an important role in increasing the biomass power capacity and reducing greenhouse gas (GHG) emissions. The challenges of the large percentage biomass co-firing (over 20% on energy basis) in existing pulverized coal boilers are keeping the same steam parameters and having a high boiler efficiency and a stable operating. READ MORE

7. 5. Reduction of the N2O Emission from Fluidized Bed Combustion by Afterburning

   Author : Lennart Gustavsson; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; chemical modelling; fuel injection; nitrous oxide; fluidized bed combustion; fluidized beds; afterburning; homogeneous heterogeneous reactions; N2O reduction; fluidized bed boiler; N2O emissions;

   Abstract : A method for reducing N2O emissions from fluidized bed combustion is presented and investigated. In contrast to flame combustion, fluidized bed combustion generates significant amounts of nitrous oxide (N2O) which are emitted to the atmosphere. READ MORE