Energy Oil-Tar Sands-Natural Gas

AP ? Of the Day Some automobiles in the US are fueled by natural gas. What is the primary environmental advantage of natural gas relative to gasoline as a transportation fuel? A. The US has 60% of the world’s proven natural gas reserves B. Natural gas is a renewable resource that is usually produced from corn and other agricultural products. C. When natural gas is burned in an automobile engine, the only emission is water vapor. D. Natural gas combustion emits fewer pollutants. E. There is an extensive retail distribution network for natural gas so natural gas is available at most gas stations.

AP ? Of the Day Some automobiles in the US are fueled by natural gas. What is the primary environmental advantage of natural gas relative to gasoline as a transportation fuel? A. The US has 60% of the world’s proven natural gas reserves B. Natural gas is a renewable resource that is usually produced from corn and other agricultural products. Which fuel is this true for? Downfall – could raise food prices. Leads to other ag-issues. C. When natural gas is burned in an automobile engine, the only emission is water vapor. D. Natural gas combustion emits fewer pollutants. E. There is an extensive retail distribution network for natural gas so natural gas is available at most gas stations.

Dimensional Analysis Steps! 1. Read the question to determine final units. 2. Set the final units at the END of a dimensional analysis equation. 3. Check that the problem is set up so that starting units are converted into ending units. 4. Simplify the math, cancel out zeros, simplify. 5. Solve the math 6. Rewrite the answer including units.

Math Practice A large coal-fired power plant produces 48 million kWh of electricity each day. Assume the following: 10,000 BTUs are required to produce 1kWh of electricity; 1 pound of coal produces 5,000 BTUs of heat; each coal car can hold 120 tons; 1 ton is 2,000 lbs. a) How much heat in BTUs is needed to operate the coal plant for one day? b) How many coal cars will be needed to operate the power plant for a day?

Today & Upcoming Register for the APES exam Form a study group Buy a review book Energy Test is now 2/24 & 2/25 – Math & Chapter reading guides due then. Notes & summary videos posted on web will help you prepare! Today – Oil, Tar Sands, Natural Gas

OIL  Oil is a fossil fuel produced by decomposition of deeply buried organic material such as plants under high temperatures and pressures for millions of years.  Crude oil (petroleum) is a thick liquid containing hydrocarbons that once extracted via drilling are separated into products through fractional distillation (utilization of various boiling points to produce gasoline, aviation fuel, heating oil, diesel oil, asphalt).

Oil Extraction & Processing  Crude oil and natural gas are trapped in porous rock beneath dome shaped structures (anticlines).  To extract oil, a well is drilled into the deposit. Then oil, drawn by gravity out of the rock pores and into the bottom of the well, is pumped to the surface.  Oil is then transported to a refinery by pipeline, truck, or oil tanker.

Oil Recovery  Primary Oil Recovery – drilling a well and pumping oil that flows by gravity into the bottom of a well.  Secondary Oil Recovery – After primary, water is injected into nearby wells to force some of the remaining oil to the surface.  Tertiary Oil Recovery (Enhanced Oil Recovery) – after primary and secondary, CO 2 gas is used to force some of the heavy oil into the well cavity so it can be pumped to the surface.

OIL DRILLING

Distillation  Then it is distilled and separated into components with different boiling points.  Some of the products called petrochemicals are used as raw materials in industrial organic chemicals, pesticides (like DDT), plastics, synthetic fibers, paints, and medicines.

Fractional Distillation Aviation Fuel Heating Oil

Who Has the World’s Oil?  The oil industry is the world’s largest business!  Eleven OPEC Countries (Organization of Petroleum Exporting Countries) have 78% of the world’s crude oil reserves.  Saudi Arabia has the largest (25%)  Canada (oil sand) (15%)  Iraq (11%)  United Arab Emirates (9.3%)  Kuwait (9.2%)

OPEC Nations

How Long Will World Oil Supplies Last?  Oil supplies MOST of the commercial energy in the world today.  Global reserves 80% depleted in next 50 years. (42-90)  US reserves 80% depleted in years.  At current rate  Saudia Arabia could supply the entire world’s oil needs for 10 years.  Reserves under Alaska’s North Slope (Prudoe Bay) would meet current world demand for 6 months and US demand for 3 years.  Estimated reserves in ANWR (Arctic National Wildlife Refuge) would meet current oil demand for only 1-5 months and US oil demand for 7-24 months.

Advantages of Oil Relatively inexpensive Easily transported via pipelines, trucks and tankers. High net energy yield Ample supply for immediate future Large US government subsidies in place.

Subsidies How much money does the U.S. government provide to support the oil, gas and coal industries? As of July 2014, Oil Change International estimates U.S. fossil fuel subsidies at $37.5 billion annually, including $21 billion in production and exploration subsidies. Internationally, governments provide at least $775 billion to perhaps $1 trillion annually in subsidies. Keeps cost to consumers low, profits good, but does not account for costs associated with climate change & human health.

Disadvantages of Oil World oil reserves limited and declining. Produces pollution SO 2, NO, NO 2, CO 2 Drilling causes land disturbances which accelerates erosion. Oil spills (Exxon Valdez) Extraction releases contaminated wastewater and brine Disruption to wildlife habitats (ANWR) Artificially low prices encourage waste

Prince William Sound

Arctic National Wildlife Refuge

ANWR

Oil Sand  Oil sand (tar sand) is a mixture of clay, sand, water and combustible bitumen (heavy oil with high sulfur content).  Dug up by giant shovels, mixed with hot water and steam to extract the bitumen, which is heated and converted to a low-sulfur synthetic crude oil suitable for refining.  Exists mostly in Canada (70% known reserves)  Severe environmental degradation to air, water and land.

Shale Oil  Oil shales contain kerogen which can be extracted from crushed oil shales by heating them to yield a distillate called shale oil.  Before it can be sent by pipeline to a refinery, it must be heated to increase its flow rate and processed to remove sulfur, nitrogen, and impurities.  Net energy loss Tar Sand - bitumen Shale Oil - kerogen

Natural Gas  Natural gas is a mixture of 50-90% by volume of methane (CH 4 ) and smaller amounts of ethane (C 2 H 6 ), propane (C 3 H 8 ), and butane (C 4 H 10 ).  Conventional Natural Gas – lies above most reservoirs of crude oil, but can only be used if a pipeline is put in place. Many times it is considered waste and is burned off adding CO 2 to the atmosphere.  Liquefied Petroleum Gas (LPG) propane and butane gases liquefied when a natural gas field is tapped. Stored in pressurized tanks for use in rural areas.  At very low temperatures LPG can be converted to Liquefied Natural Gas (LNG) can be shipped in refrigerated tankers.

Natural Gas Information  Russia has 31 % of world’s gas reserves, followed by Iran (15%), and Qatar (9%).  Known reserves and undiscovered potential reserves of conventional natural gas should last the world for years.  With an increase in consumption of 2% per year, that could be reduced to 80 years!

Advantages of Natural Gas Relatively inexpensive and pipelines in place in USA High net energy yield Produces less air pollution than other fossil fuels Extraction not as harmful as for oil and coal Easily processed and inexpensive to transport Can be used in fuel cells (a cell producing an electric current directly from a chemical reaction) Viewed as “transitionary fossil fuel” as world switches to alternative energy resources.

Disadvantages of Natural Gas H 2 S (hydrogen sulfide) and SO 2 released during processing, and CO 2 and hydrocarbons during burning. LNG processing is expensive, dangerous, and results in lower net energy yield Leakage of pipes and tanks (CH 4 ) contributes to global warming Extraction releases contaminated wastewater and brine Land subsidence (sinking of earth’s surface) Disruption to wildlife habitats (ANWR)

Another Note on Global Warming  Subsidies for oil and gas encourage high use of the energy resource and discourages conservation.  Oil and gas are considerably cheap (10-12 cents per kwh)  The Earth Summit, June 1992 “UN Conference on the Environment” Issue #1 - Climate Change Treaty – A treaty to curb CO2 emissions, thereby reducing global warming. More than 165 nations signed the treaty and is now considered legally binding. President Clinton signed in Congress failed to approve it and it has not been ratified since in the US.  Kyoto – Bush refused to sign “Bad for Economics”.

Tar Sands – a possible FRQ Link 

Rest of class Work on your math problems, grids, or chapter reading guides. I have review books you can borrow during class time.