Unit+4

Once you have finished your reading we are going to try something different for an assignment:

You are going to do something new. Don't be intimidated you will do just fine and you might enjoy it! I would like all of you to draw a process unit from Chapter 6 of your book using "Microsoft Word." If you open a "Microsoft Word" document you will see a tab labeled Insert.


 * Click on the insert tab and then go to shapes.
 * These shapes choices will allow you to create components of the process unit.
 * It will allow you to place arrows in the document to indicate flow direction.
 * Using these shapes You will be able to construct vessels, exchangers, pumps, etc.
 * Lastly You should add color to your document to improve its appearance.

(This does not need to be perfect but it should be accurate.)

-Make sure that you label the vessels and equipment so that I know what it is. "Textbox" will probably work best for adding labels

This will help you learn one of the process units in the Chapter 6.

Let me know if you have trouble with this... I will try to help you out.

*Assignment: Now that you have created your diagram it is time to get to the heart of this project.... You and others with the same unit are going to teach the rest of the class how your unit works. Your lesson should include visuals, videos and content relevant to this unit. You will also submit a 20 point quiz which will assess the the understanding of the class. You will have this class period to work on this. Lesson = 20 points Quiz = 10 points Total = 30 points



Dehydration Possibities

Mole Sieve Uses specially engineered beads to "trap" water molecules in its pores and allows the glycol to "slip" by.
 * Water is an incredible small molecule when compared other molecules. It's approximate diameter is 2.75 angstroms. There is 100 picometers to 1 angstrom so this is 275 picometers or 0.275 nanometers. In an attempt to help illustrate this think about the centimeter. We all know a good estimation off the tops of our heads what a centimeter is. Now break that single centimeter into 10 million parts. Each one of those individual parts is one nanometer. A water molecule is about a quarter of that.
 * In comparison the smallest of the glycols we have discussed are approximately 2 nm in size. So they don't fit in the pores and slip by the bead bed.



Usually there are cycle times from anywhere to 8 hours to 24 hours on one mole sieve and then the wet gas switches to go to the other mole sieve. So it would go from one mole sieve for 8 hours and then swap to the other mole sieve for 8 hours; it could be upwards of 24 hours on one mole sieve it all depends on how much gas is going through the mole sieve and the capability of the mole sieve.
 * Wet gas enters the scrubber vessel first. This vessel removes some of the free liquids entrained in the gas.
 * Exiting the scrubber the gas continues to one of the two molecular sieves; Mole Sieve 1 and Mole Sieve 2.
 * One mole sieve will be active (online: removing water) and a second will be regenerating (drying out the molecular material).
 * The functions of the sieves are always opposite of each other in the cycle… one will always be active and one will be regenerating.
 * Our image portrays Mole Sieve 1 as active and that Mole Sieve 2 is regenerating.
 * Wet gas comes from the scrubber, passes through a valve and enters Mole Sieve 1.
 * Wet gas travels through Mole Sieve 1 entering the top traveling through beads to the bottom.
 * The function of the beads is to adsorb the moisture from the wet gas.
 * Dry gas exits the bottom "Dry"and leaves this system.
 * The moisture remains locked within the drying medium (beads).
 * Regenerating occurs in the other sieve which contains water saturated beads.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 190%;">Some dry gas gets diverted to the reheater raising the temperature of the gas.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 190%;">The hot gas is then sent to the bottom of Mole Sieve ,#2 which is offline or regenerating, and travels to the top of the sieve.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 190%;">This sieve is saturated with water. We want to force the moisture to release from those beads so this mole sieve can be "Active" again.;
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 190%;">Hot gas travels up this mole sieve and forces the moisture to release from the beads.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 190%;">The hot gas will entrain the moisture from the beads of the mole sieve.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 190%;">Wet gas leaves the top of the mole sieve.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 190%;">The hot wet gas travels to a cooler where the water (moisture) will condense into liquid and will be knocked out in a scrubber vessel.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 190%;">Wet gas travels to a compressor where it is then re-compressed and circulated back to the beginning of the system.

__<span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 190%;">TEG Dehydration __ media type="youtube" key="My7zhjUtAwQ" height="811" width="1092" align="center"

<span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The TEG Dehydration process is quite similar to the Amine Sweetening Unit. <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">In fact they are the same except that in the TEG unit removes water from the inlet gas, while the Amine Unit removes H2S and CO2.


 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">There is both a Contactor and a regenerator in this process unit; a glycol contactor and glycol regenerator.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The glycol contactor (absorber) operates at higher pressures and lower temperatures.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The glycol regenerator operates at lower pressures and higher temperatures. Keep that in mind because that is how we are absorbing the water and stripping it within this unit.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The wet gas moves through a scrubber before reaching the contactor.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The contactor allows lean glycol to enter the column at the top in liquid form.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The liquid Glycol cascades down the column from one tray to the next tray.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">Wet gas travels up the contactor through the trays and Glycol (remember our discussions on plate design).
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The lean glycol grabs (absorbs) the water from the gas and moves it down the column.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">Dry gas is going to exit the top of the column.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The glycol is now considered rich because it is rich in water content entrained within it.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The rich glycol enters a heater and is....heated.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The heated rich glycol enters a flash drum reducing its pressure.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">Rich glycol enters another heater (lean/rich heat exchanger) which elevates the rich glycol temperature.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The low pressure/high temperature rich glycol now enters the regenerator.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The regenerator "strips" the entrained water from the glycol.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">Regeneration is necessary so that the glycol can be reused.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">A steam or hot oil reboiler that is needed for the operation of this column.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The water vapors will travel up and out of the column.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The water vapors get condensed by the condenser located in the upper portion of the regenerator tower.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">Water vapors will condense and travel to the accumulator.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The accumulator vessel is basically a storage tank that allows for storage of some liquid stock while returning a portion of the liquid stock back into the tower as reflux to improve product purity.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">Prevents glycol from leaving the system with the water. What doesn’t go back down the column as reflux is going to get sent out of the system as water vapor; so this is where all of the water vapor leaves the unit.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">Lean glycol is sent to the surge drum after leaving the reboiler.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The surge drum is a resevoir for excess glycol for the system = maintains liquid level for the system.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">Glycol leaves the surge drum and travels to the lean/rich heat exchanger. The HOT lean glycol gives its heat up to the rich glycol entering the regenerator tower. Cooling the lean glycol before entering the contactor.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The cooler lean glycol moves through a pump icreasing to desired flow rates.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The lean glycol then travels through a chiller (propane) cooling the glycol further.;
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The lean glycol moves back down the contactor to absorb the moisture or water in the gas.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The cooler lean glycol moves through a pump icreasing to desired flow rates.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The lean glycol then travels through a chiller (propane) cooling the glycol further.;
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The lean glycol moves back down the contactor to absorb the moisture or water in the gas.
 * <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 200%;">The lean glycol moves back down the contactor to absorb the moisture or water in the gas.

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