Project Report (Edit) - Jessica Hwang, Ivan Chua, Tiong...

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Jessica Hwang, Ivan Chua, Tiong Soon Lee, Mandy Duvall Group 28 Project Report SO 2 Removal from Power Plant Stack Gases In today’s world, coal is burned in many power plants to generate electricity. However, the process generates a significant amount of pollutants which would accumulate in the air if they are not treated before being released into the atmosphere. Gases that are “untreated” contain soot, nitrogen dioxide, ash, and sulfur dioxide. More importantly, though, stack gases contain large quantities of ash and sulfur dioxide. Sulfur dioxide, especially, is hazardous to our environment because it is a major contributor to acid rain which has harmful effects on plants, aquatic animals, and infrastructure. Our team of chemical engineers, called Group 28, has designed a method to reduce the amounts of sulfur dioxide and fly ash vented to the atmosphere, by converting the sulfur dioxide to a stable insoluble substance and removing the fly ash before the gases from the furnace are released. Furthermore, we have met a design standard of 0.40lb sulfur dioxide per 10 6 BTU rather than the minimum EPA standard of 0.50lb sulfur dioxide per 10 6 BTU. The system comprises of a furnace connected to a boiler and three scrubber systems. Coal is fed into the furnace with excess air for combustion. The energy produced by this reaction is used to heat the water in the boiler to steam, which turns a turbine to generate energy. At the same time, calcium carbonate is fed into the furnace to produce calcium oxide, a compound that can form a solid compound with sulfur dioxide. The gaseous products from the furnace are split into three identical streams where they are run through a scrubber which reduces the amount of sulfur dioxide in the streams. The streams are subsequently recombined and released into the atmosphere. We will concern ourselves mainly with the reduction in sulfur dioxide from the flue gas of the power plant. For the purposes of our project, the following chemical equations apply: S + O 2 SO 2 4H + O 2 2H 2 O C + O 2 CO 2 CaCO 3 CaO + CO 2 2CaO + 2SO 2 + O 2 CaSO 4 1. A flow chart of the process has been constructed to aid understanding and elucidate the components of each process stream.
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Jessica Hwang, Ivan Chua, Tiong Soon Lee, Mandy Duvall Group 28 2. First, we need to obtain the amount of dry coal per 100kg of wet coal. Our group was assigned coal with 4.58kg of moisture for every 100kg of wet coal feed. Then using the coal compositions from “Table 1: Coal Properties”, the amounts of each element in the reactor feed was found. Basis: Wet Coal= 100kg Moisture: kg water 100 kg wet coal Mass of Dry Coal: 95.42 kg Coal Composition Component Dry Weight % Mass kgmol Ash 8.70% 8.30 - Sulfur 4.10% 3.91 0.12 Hydrogen 6.20% 5.92 5.87 Carbon 70.70% 67.46 5.62 Nitrogen 1.90% 1.81 0.13 Oxygen 8.40% 8.02 0.50 3. We will first begin by calculating how much oxygen is required for the complete combustion of coal. S + O
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Project Report (Edit) - Jessica Hwang, Ivan Chua, Tiong...

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