Select all the attributes and achievements of Dick Fosbury?
Homework Help for Engineering
Engineering is the knowledge oriented towards the invention and use of techniques for the exploitation of natural resources or for industrial activities.
A multiple-effect evaporator is an apparatus for efficiently by means of the heat from steam to evaporate water. Water is boiled in a sequence of vessels, each held at a lower pressure than the last. Because the boiling temperature of water decreases as pressure decreases, the vapour boiled off in one vessel can be used to heat the next. and only the first vessel requires an external source of heat. While in theory. evaporators may be built with an arbitrarily large number of stages, evaporators with more than four stages are rarely practical except in systems where the liquor is the desired product such as in chemical recovery systems where up to seven effects are used. Multiple effect evaporation commonly uses sensible heat in the condensate to preheat liquor to be flashed. In practice the design liguid flow paths can be somewhat complicated in order to extract the most recoverable heat and to obtain the highest evaporation rates from the equipment. The evaporator is used to remove the solvent from the solution. In the four stage evaporation system used in sugar cane industries, a 50% by mass sugar solution is concentrated to by 65% by evaporating an equal amount of water in each of four stages. With total input of 50,0XX lb/h, a product stream of 35,0XX lb/h is produced.
Draw the block flow diagram?
Write the general material balance for the system?
Determine the compositions of intermediate stream?
Whether the mass flow rate of each stream can be calculated? If yes or no, justify your answer.
Perform the Degree freedom of analysis of overall system and individual units?
Write the strategy to solve the problem.
Gas-liquid absorption columns are primarily used to clean gas streams from chemicals that should not be released into the environment. Sulfur dioxide (SO2), carbon dioxide (CO2) and other gases are found in industrial waste streams and contribute to air pollution. A gas stream flowing at 100 mol/h contains 20 mol% oxygen, 70 mol% N2, and 10 mol% H20 is passed through a packed column with absorbent solids. The absorbents in the column absorb 97% of the water but none of the gases. Calculate the mole fraction of oxygen in the product gas.
7. The most efficient way to separate the hydrocarbons into smaller fractions is called fractional distillation. Short hydrocarbons (one to five carbons) are gases at room temperatures because they have such low boiling points. A hydrocarbon feed CH consisting of a mixture of propane (20%), isobutene (30%), isopentane (20%), and n pentane (30%) is fractionated at a rate of 100 kg/h into a distillate that contains all the propane and 78% of the isopentane in the feed. The mole fraction of isobutane in the distillate is 0.378. The bottom stream contains all the n-pentane fed to the unit. Determine the flow rate of the bottom stream. Write inlet and outlet stream with different system of units.
Producer gas is fuel gas that is manufactured by blowing a coke or coal with air and steam simultaneously. It mainly consists of carbon monoxide, hydrogen, as well as substantial amounts of nitrogen. The caloric value of the producer gas is low. Such a producer gas contains 28% CO, 3.5% CO2, 0.5% 02 and 68% N2. 100 kg of this gas is burned with 20% excess air. If the combustion is only 90% complete, determine the following:
(a) The composition of the flue gas
(b) The weight of the gaseous products
(c) If the excess air increased to 40%, whether the combustion reaction in completed? Justify your anaswer.
The air separation unit is an important energy-consuming unit in the process of ammonia synthesis. For the ammonia process with pure oxygen gasification, the purity of oxygen products in the air separation unit is generally 99.6%. If the oxygen purity from the air separation is reduced properly, its energy consumption will decrease effectively, and the energy consumption of the whole ammonia process may further decrease, as the nitrogen element is needed for ammonia synthesis. However, with the increase of the flow rate, the operating cost of the subsequent unit would increase, so there is an optimal purity that could minimize the energy consumption of the whole process. An ammonia-air mixture containing 10% ammonia is sent to an absorber in which 90% of ammonia is absorbed.
(a) What is the mole fraction of ammonia in the gas leaving?
(b) Express the composition of the exit gas from the absorber in weight percent.
(c) What is the average molecular weight of the gas entering and leaving the column? (Average molecular weight of air is 29)
Flue gas is the gas leaving to the atmosphere via a duct, which is a pipe or channel for conveying exhaust gases from a fireplace, oven, furnace, boiler or steam generator. Quite often, the flue gas refers to the combustion exhaust gas produced at power plants. Its composition depends on what is being burned, but it will usually consist of mostly nitrogen derived from the combustion of air, carbon dioxide (CO2). and water vapor as well as excess oxygen. It further contains a small percentage of a number of pollutants, such as particulate matter, carbon monoxide, nitrogen oxides, and sulfur oxides. As per the annual report released by sohar power plant, the company produces the flue gas in to atmosphere and it has the following composition by volume percent:
CO: 34.8, H2: 42.0, CH4: 0.4, CO2: 5.5, O2: 0.2, and N2: 17.1. Calculate
(a) The composition in mass percent
(b) The average molecular weight
(c) The density at standard conditions in kg/m.
Assume suitable conditions/ assumptions to solve the problem and justify your assumptions. Write the step by step by procedure of solution.
(a) Write notes on liquid- liquid Extraction & explain with neat diagram.
(b) A mixture of phenol and water under certain conditions of temperature and composition forms two separate layers, one rich in phenol and the other rich in water. At 300 K, the composition of the upper and lower layers are 70% and 9% by weight of phenol respectively. If 40 g of phenol and 60 g of water are mixed and the layers are allowed to separate at 300 K, what will be the weights of the two layers?