A natural gas power plant uses 505Mg of natural gas per day (volume converted to weight via density ). The energy value of the natural gas is 37.3 MJ/kg. The plant produces 1.81 *10^6kWh of electricity each day
a.) what is the efficiency of the plant
b.) how much energy is lost please include all base equations engineering principles and general formulas and use.
c.) assuming all energy is converted to heat how much water is needed to absorb the energy lost to heat per day. Assume the water is put back into a stream after heating and the fish in the receiving stream can only withstand temperatures up to 22 degrees
d.) if you were to consider the entire life cycle of producing energy from natural gas, what other flows and process must be considered?
Mass of natural gas used per day = 505 Mg
1 Mg = 1000 Kg
So mass used = 505000 Kg
The energy value of natural gas = 37.3 MJ/kg
Total energy produced = 505000(37.3)= 18836500 MJ= 1.88365 ×1013 J
Electricity produced = 1.81×106 KWh
Electricity produced = 1.81×106(1000) (3600) = 6.516×1012 J
A) Efficiency of plant
= 1-((6.516×1012) /(1.88365×1013) ) = 0.6540 = 65.40%
B) according to lae of conservation of energy
Energy can neither be created nor destroyed hence
Energy lost =
(1.88365×1013) -(6.516×1012) = 1.23205 ×1013 J
C) all lost energy is converted to heat
Q= 1.23205×1013 J
Assume initial temperature of water is 10 °C
Cp = 4.18 KJ/Kg°C
1.23205×1013 = m(4.18×1000)(22-10)
m= 245624.0 Mg
D) if entire life cycle of producing natural gas is considered
The processes that needs to be considered
Purification of natural gas
Compression of natural gas
Combustion of natural gas
Turbine which extracts energy from combustion
All efficiencies of compression, combustion and energy extraction need to be taken care of
Please upvote if helpful
A natural gas power plant uses 505Mg of natural gas per day (volume converted to weight...
Combined Gas and Steam Power Plant The highest temperature at the inlet of a gas turbine can be 1600oC. The temperature of the ambient air is 27oC. Determine the maximum pressure ratio and the associated efficiency. Determine the conditions (temperatures and pressure) at the various points of the cycle. What’s the maximum temperature of the exhaust gases? Determine the amount of natural gas required for a 500 MW plant. Determine the associated emissions. What’s the total amount of exhaust gas?...
You are the design engineer for a natural gas co-generation power facility shown in the diagram below. You have been asked if the facility's exhaust gas can be fed to a greenhouse in order to grow plants without having to add a make up stream of air to cool it. This can be done if the temperature of the facility's exhaust gas is less than 130°F (54.4°C) In steady state, the Gas engine is fed a stream of natural gas...
Combined cycle power plants are common because of their high efficiency and scalability. They typically combine a gas turbine cycle (the Brayton Cycle) with a steam turbine cycle (the Rankine Cycle) [1]. The goal of this project is to determine the operating efficiency and profitability of a realistic combined cycle power plant. The power plant is as follows: 1. A natural gas-fired Brayton cycle with mÛ air,Br = 1.25 kg s−1 . (a) Ambient air at 1 bar and 300...
Air stored underground at 500 psia and 200 deg.F is first heated by natural gas combustion to 2,340 deg.F at constant pressure, then expanded in an 89% efficient turbine to atmospheric (14.7 psia) pressure. Part of the work of the turbine is used to compress ambient air at 70 deg.F and 14.7 psia to store it underground with an 85% efficient compressor. The air that is stored underground loses heat to the surroundings. The turbine powers an electric generator that...
An experimental power plant at the Natural Energy Laboratory of Hawaii generates electricity from the temperature gradient of the ocean. The surface and deep-water temperatures are 30 ∘C and 5 ∘C, respectively What is the maximum theoretical efficiency of this power plant? If the power plant is to produce a power of 180 kW , at what rate must heat be extracted from the warm water? Assume the maximum theoretical efficiency (in watts). At what rate must heat be absorbed...
A natural gas-fired furnace in a Textile Plant is used to provide steam at 140 0C. At times of high demand, the furnace supplied heat to the steam at rate of 30 MJ/s. The plant also uses up to 6 MW of electrical power purchased from the local power company. The plant management is considering converting the existing process plant into a Cogeneration Plant to meet both their process-heat and power requirements. Your job is to come up with some...
Please answer Questions e-f-g-h: (a) The boiler of a power plant operates at a maximum temperature of 750oC. The condenser of the power plant draws in cooling water at 20oC. What is the theoretical maximum efficiency of the plant? (b) Now suppose that a real power plant is built to have an efficiency that is 80% of the theoretical efficiency. The power plant needs to generate 1GW (giga-watt) of power. How much energy (per second) needs to be supplied by...
1. What is the purpose of a constant volume gas thermometer. How does it work? 2. What is the difference, if any, between a isothermal and adiabatic thermodynamic process. Draw them on a pV diagram. 3. Does the First Law of Thermodynamics apply to solids and liquids? Why or why not. 4. What is the most important heat transfer mechanism on earth where there is an atmosphere? Explain how this can cool a nuclear or coal fired power plant, and...
Absorption and transmission: When a photon of light hits a molecule of gas or a particle in the atmosphere, there are three possibilities: 1) it can be absorbed (the energy is converted to heat), 2) it can be reflected (it continues on but in a different direction), 3) or it can be transmitted. These processes determine our ability to see distant objects (such as the mountains around Los Angeles and Irvine) and the colors in the sky (such as blue...
*) (15 p) We considera muclear reactor of power output P-1000 Megowott 1000 million wot elect, can with Plutonium. Bifueled, initially with 1000 kg of Plutonium. The nuclear teslim 239 question is made of Plutonium nuclei, each consisting in 94 protons and 239-94145 euro the symbol For thermodynamical reasons, only 1.3 in the form of heat produced by the reactor, can be converted into electricity. How much mass deficit should the nucle fuel of concer delicates if the reactor is...