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[en] The overview of the solutions used in EBFGT process and adaptation of process parameters for flue gas from combustion of various fuels was presented. The inlets parameters of flue gas from four fuels with high emission of pollutants, process parameters and process constrain were analysed. Also the main problems of this technology and their solutions were presented. (author)
[en] Lakhra coal field is largest productive coal field of Pakistan. About 1.5 millions tonne of this coal is, annually, mined and transported daily to various parts of the country in 500 trucks each of 10 tonnes of coal. The major consumers of this coal are brick kilns located in Sindh and Punjab. It is available at Rs. 500/- per tonne at mine head. A number of attempts were made for the production of power (electricity) by foreign companies. Feasibility studies were undertaken but no one set up power plant. It may be due to inferior quality of coal as it is lignitic in nature with high ash and sulfur contents. This coal is also, very sensitive to spontaneous combustion. Spontaneous combustion is the auto-ignition of coal at ambient conditions. Hence there are storage problems. In spite of these drawbacks, a 3(50) Mega Watt (3 units of each 50 mega watt power generation capacity) power plant, based on atmospheric fluidized bed combustion of coal technology (AFBC), was setup in early nineties. The performance of this plant remained poor. The main reasons might be poor quality of coal and limestone. Limestone is used with high sulfur Lakhra lignite, in fluidized bed combustor, to arrest sulfur of the coal, fixing sulfur as calcium sulfate to minimize hazardous emissions of sulfur dioxide (SO/sub 2/). Spontaneous combustion of Lakhra lignite is responsible for each fire of coal and conveyor belt etc. (author)
[en] The report gives results of an evaluation of the potential of thermal agglomeration as a means of enhancing the collection of fine particle emissions. Available theoretical and experimental information indicates that this method of particle agglomeration offers no useful avenue for improving fine particle control
[en] Highlights: • The temperature regulation characteristics of double-reheat boilers remain elusive. • A cell model was established to simplify the calculation of double-reheat boilers. • The steam temperatures and their regulation characteristics were predicted. • The main steam temperature was most sensitive to flue gas recirculation. • This study provided further insights into the regulation characteristics. A cell model of double reheat boilers that simplifies thermodynamic calculation was developed to predict the steam temperature characteristics of a flexible 660 MW ultra-supercritical double reheat tower-type boiler. By virtue of the model, the characteristics of steam temperatures under different loads were obtained and the effects of swinging burners, regulating gas dampers, and gas recirculation on the steam temperatures were analyzed based on the 660 MW double reheat boiler. The results showed that the main and reheat steam temperatures had radiation and convective characteristics, respectively. The main steam temperature was found to be more sensitive to flue gas recirculation, whereas reheat steam temperatures were more sensitive to gas damper regulation. The average regulation ranges of secondary reheat steam temperatures were ±32.7 °C and ±8.1 °C for the maximum ranges of dampers and gas recirculation, respectively. This study provided further insights into the steam temperature regulation characteristics of double reheat boilers.
[en] In order to meet the growing energy needs, alternative energy sources particularly bio fuels are receiving increasing attention during the last few years. Biodiesel, consisting of alkyl monoesters of fatty acids from vegetable oils or animal fats, has already been commercialized in the transport sector. In the present work, a turbo charged, inter cooled, DI (Direct Injection) diesel engine was fuelled with biodiesel from waste cooking oil and its 20% blend with commercial diesel to study the regulated exhaust pollutants in the light of combustion parameters in the cylinder. The experimental results show that BTE (Brake Thermal Efficiently), MCP (Maximum Combustion Pressure) and SOI (Start of injection) angle were increased, ID (Ignition Delay) was decreased; however, RHR (Rate of Heat Release) remained almost unaffected in case of biodiesel. The BTE and RHR were not much affected with B20; however Sol angle and MCP were improved, and ID was decreased with B20. Smoke opacity, CO (Carbon Monoxide), and HC (HydroCarbons) emissions were decreased, but NO. (Oxides of Nitrogen) pollutants were increased in case of both B100 and B20 compared to fossil diesel. However, the increase in NO emissions was lower with B20. (author)
[en] The operation mode of slurry recirculation pump and the limestone slurry feed were optimized in order to reduce the power consumption and material consumption of the wet flue gas desulfurization facility in a 330MW ultra low emission coal-fired power unit. The results show that the electricity consumption of WFGD has decreased by optimizing the operation mode of the slurry recirculating pumps. The operating current of the slurry recirculation pumps decreased by 33.25A on average and the electricity charge could be saved 441,000 yuan per year. A feed-forward PID control strategy of limestone slurry feed has been successfully used in the WFGD. A desired tracking performance is achieved and the limestone slurry supply was reduced by 0.0187 ton/(ten thousand of kWh). (paper)
[en] Highlights: • Cu-BTC was reported as a potential candidate for CO2 capture and concentration from flue gas. • Synthesis recipe for Cu-BTC is modified due to its application in CO2 capture. • Best regeneration condition for Cu-BTC sample is investigated to reach higher adsorption capacity. • Synthesized and commercial Cu-BTC adsorbents are evaluated for suitability for CO2 capture and concentration from flue gas.