HySEE Preliminary Processing and Screening
Making and testing a biodiesel fuelmade from ethanol and waste french-fry oil

Prepared by
Charles L. Peterson, Professor; Daryle
Reece, Engineering Technician;
Brian Hammond, Graduate Assistant; Joseph C. Thompson, Engineering Techniciaan;
Sidney Beck, Professor Emeritus, Bacteriology

Idaho Deparment of Water Resources

Energy Division
Boise, Idaho

Printed on recycledpaper

Costs associated rilh lhid publlcallon are avaibbla
from the Idaho Deparlmenl d Waler Rs~urcen In caxdanw
with Seciice 60202. Idaho Code.
IDWR-a%,so, 34sa2

ACKNOWLEDGEMENT

This project was undertaken by the University of Idaho, Department of AgriculturalEngineering, under contract to the Idaho Department of Water Resources (IDWR). The
project was made possible in part with funds provided by the U.S. Department of Energy(USDOE) through the Pacific- Northwest and Alaska Regional Bioenergy Program.

DISCLAIMER
Any opinions, findings, conclusions or recommendations expressed herein are those of theauthors and do not necessarily reflect the views or endorsement of USDOE or IDWR.

HYSEE PRELIMINARY PROCESSING AND SCREENINGTABLE OF CONTENTS
Introduction.................................................

1

Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
MaterialsandMethods
Procedures...........................................

................................................. .

Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

INDEX OF TABLES AND FIGURES
Table 1

Fuel characterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 2

Injector coking data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 1

Injector coking photographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 2

Power and torque versus RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 3

Fuel consumption versus bmep at 2500 RPM . . . . . . . . . . . . . . . . . . 16

Figure 4

Fuel consumption versus bmep for HySee at 3 RPM’sfrom engine mapping test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 5

Thermal efficiency versus bmep from thefuelmappingtestat25OORPM . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 6

Engine oil viscosity at 50 hour oil changeintervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..lg

Figure 7

Concentration of iron in engine oil analysis . . . . . . . . . . . . . , . , . . . 18

Figure 8

Concentration of silicon in engine oil analysis . . . . . . . . . . . . . . . . . . 19

HYSEE PRELIMINARY PROCESSING AND SCREENING

Charles L. Peterson, Daryi L. Reecq Brian Hammond
Joseph C. Thompson, and Sidney Beck’

INTRODUCTION
Due to increasing environmental awareness, Biodiesel is gaining recognition in the United States as arenewable fuel which may be used as an alternative to diesel fuel without any modifications to theengine. Biodiesel fuels can be produced from ethanol and vegetable oil, both agriculturally derived
products. As such, they provide several advantages: they are renewable, they are safer, they are
biodegradable, they contain little or no sulfur and they reduce engine exhaust smoke. Currently, thecost of this fuel is a primary factor that limits its use. One way to reduce the cost of Biodiesel is touse a less expensive form of vegetable oil such as waste oil from a potato processing plant.
Idaho produces approximately 120 million cwt of potatoes from over 152,000 ha annually. Nearly
60 percent of these are processed., the vast majority being made into French tied potatoes. These
operations use mainly hydrogenated soybean oil, some beef tallow and canola It is estimated that
there are several million pounds of waste vegetable oil Tom these operations each year. Additional
waste fryingoil is available from smaller processors, off-grade oil seeds and restaurants.
One of these processors, produces over 2 billion pounds of frozen potatoes per year at plants inOregon, Idaho and North Dakota. This company built two ethanol plants in the late 1980’s, which
use potato waste as the feedstock. One plant provides an opportunity for a Biodiesel facility using
waste vegetable oil and ethanol to produce hydrogenated soy ethyl esters (HySEE). The market
value of waste frying oils is about $0.11 per liter ($0.40 per gallon). Ethanol has a plant value ofabout $0.28 per liter ($1.05 per gallon). It is projected that this facility could produce Biodiesel atonly slightly over $0.25 per liter ($1.00 per gallon) making it economically comparable to diesel fuel.
Biodiesel is being demonstrated as a motor fuel in an ongoing project entitled, “Demonstration of theOn-the-Road Use of Biodiesel.” This project is a cooperative effort between the University of Idaho
and the Idaho Department of Water Resources. Hydrogenated soy ethyl ester (I-IySEE) has good
possibilities for use as a diesel fuel substitute because:‘The authors are Professor, Engineering Technician, Graduate Assistant, Engineering
Technician and Professor Emeritus of Bacteriology, all at the Department of AgriculturalEngineering, University of Idaho, Moscow, ID 83844-2040.
1

Biodiesel made from waste fi-ench fry oil may be cost competitive with diesel fuel and otherdiesel substitutes.
Ethyl Esters may reduce emissions which may help open markets in urban areas.
Ethyl Esters are made from ethanol and vegetable oil. They are therefore completely biomass
derived products.
,
Ethanol is less toxic, making it safer to work with than methanol.
This study examines short term engine tests with HySEE and number 2 diesel fuel (D2). Four engine
performance tests were conducted including an engine mapping procedure, an injector coking
screening test, an engine power study and a 300 hour endurance test In addition emissions testing of
HySEE -was conducted at the Los Angeles County Metropolitan Transit Authorities (MTA)
Emissions Testing Facility @IF).
OBJECTIVES

1. Produce 1000 liters of HySEE using the University of Idaho’s Agricultural Engineeringtransesterification process.
2. Perform fuel characterization tests on the HySEE according to the ASAE proposed

Engineering Practice for Testing of Fuels from Biological Materials, X552.
3. Conduct short term injector coking tests as reported in Korus, et al. (1985) using HySEE withthree replicate runs on a John Deere 4239T test engine. This test includes torque tests andmapping engine performance.
4. Conduct a 300 hour engine durability screening test using the Agricultural Engineering

Department’s Yanmar TS70C single cylinder diesel engines.
5. Compare regulated emissions data including total hydrocarbons (HC), carbon monoxide(CO), carbon dioxide (CO,), nitrogen oxides (NOx), and particulate matter (PM) for HySEE
and diesel control fuel.
MATERIALS AND METHODS
Fuel Production

The potato processing company supplied a sufficient amount of waste hydrogenated soybean oil toproduce 1000 liters of HySEE. This was produced at the University of Idaho’s AgriculturalEngineering Laboratory farm scale processing facility using a recipe developed by the AgriculturalEngineering Department personnel. Phillips 66 Company low sulfur diesel reference fuel was used2

as the baseline fuel for the engine performance testing and emissions testing, and D2 from a local
vendor was used for the 300 hour endurance engine testing.
Fuel Characterization
The fuels were characterized by evaluating the parameters required in ASAE EP X552. The tests
for specific gravity, viscosity, cloud point, pour point, flash point, heat of combustion, total acidvalue, catalyst, and fatty acid composition were performed at the Analytical Lab, Department ofAgricultural Engineering, University of Idaho. The boiling point, water and sediment, carbon
residue, ash, sulfur, cetane number, copper corrosion, Karl Fischer water, particulate matter, iodine
number, and the elemental analysis were performed at Phoenix Chemical Labs, Chicago Illinois.
The high performance liquid chromatograph (HPLC) and titration analysis for total and free glycerol,
percent of oil esterified, free fatty acids, and mono-, di-, and trigylicerides were performed byDiversified Labs Inc., Chantilly, Virginia.
Engine Performance Tests
All engine performance tests were conducted in the engine performance lab at the University of
Idaho. The equipment used and tests conducted are described below. The short term tests were
performed with an in-line four cylinder John Deere 4239T turbocharged, direct injected diesel
engine. It has a displacement of 3.9 liters (239 cubic inches), a high RPM of 2650,61 kW (82 hp)
at 2500 RPM, and 290 Nm (214 ft Ibf) torque at 1500 RPM. It is attached to a General Electric 119
kW (159 hp) cradled dynamometer. The engine was not modified in any way for use with renewablefuels.

A Hewlett Packard data acquisition unit (model 3497-A) and a personal computer were used tocollect data every thirty seconds during each of the tests. Torque, power, opacity, fuel consumption,and temperatures of various engine parameters were monitored throughout the testing and saved into
a data file.

Fuel Flow Equipment -- The fuel delivery and return lines were adapted with quick couplers for fastand clean changing of the fuels. Individual 19 liter (5 gallon) metal fuel tanks were modified witha fuel filter and flexible fuel lines which could be connected to the engine quick couplers. Fuel flowrate was determined by direct weighing. The fuel containers were placed on an electric 45.4 kg (100lb) scale accurate to 23 grams (0.05 lb) with RS232 capability.

Opacity Meter - A Telonic Berkley model 200 portable opacity meter was connected to the dataacquisition unit. The opacity meter consists of a light source positioned on one side of the exhaust
stream and a photo resistor mounted on the opposite side. The meter provides an output voltage
ranging from 0 to 1 .OO volts. One hundred percent opacity (1 .OO volt) corresponds to no lighttransmission whereas 0 percent opacity (0.0 volts) corresponds to complete light transmission.

Injector Coking Test -- Carbon build-up within the combustion chamber and piston ring groove
area is a potential problem with alternative fuels. The injector coking test uses an easily removablepart from the combustion chamber (the injector) and a short engine test to determine the carbon
deposition on direct injection diesel nozzles. The injector coking tests were performed using theprocedure described in “A Rapid Engine Test to Measure Injector Fouling in Diesel Engines Using
Vegetable Oil Fuels” (Lotus et al., 1985). The engine was operated for ten minutes at each interval
for data collection.
Torque Tests - In addition to the injector coking test, a torque/horsepower test was triplicated. The
torque tests were performed with the engine operating from 2600 RPM to 1300 RPM in 100 RPM
increments with the same data collection procedure as previously described. The engine wasoperated for 2 l/2 minutes at each RPM for data collection.
Mapping Engine Performance - The engine mapping performance test was also triplicated. The
engine mapping tests were performed using the procedure described in “Procedure for Mapping
Engine Performance-Spark Ignition and Compression Ignition Engines” (WE J13 12, 1990). The
mapping tests were performed at 2500,2250, and 2000 RPM with loadings of 100,75,50,25, and0 percent of maximum power. The engine was operated for 5 minutes at each data collection
interval.
300 Hour Engine Endurance Test with HySEE and Diesel
Two Yanmar TS70C single cylinder, 4-cycle, horizontal diesel engines were used for this test.
These engines have a bore and stroke of 80 mm and 75 mm respectively, a displacement of 0.376
liter, a continuous rating output of 6 horsepower at 2200 RPM and a compression ratio of 21.2 to
1. The engines have a precombustion chamber combustion system and a condenser type coolingsystem with a cooling water capacity of 2.0 liters. The engines drive alternators which are connected
to a pair of electric load banks. A timing circuit switches the load between the engines every twenty
minutes. Each engine ran for 300 hours, one with 100 percent HySEE and the other with 100
percent diesel #2 (D2). The testing began June 7 and ran continuously for 150 hours until June 13,
with the exception of oil changes. The first 150 hours of testing was with both engines operating
at the same load. The second 150 hours they operated at the same high RPM.
Emissions Testing
The emissions tests were conducted at the Los Angeles County Metropolitan Transit Authorities(MTA) Emissions Testing Facility (ETF) with a 1994 Dodge pickup which has a direct injected,
turbocharged and intercooled, 5.9 L Cummins diesel engine. This facility has instrumentation tomeasure all regulated emissions: total hydrocarbons (HC), carbon monoxide (CO), carbon dioxide(CO?), nitrogen oxides (NOx), and particulate matter (PM). A comprehensive description of thisfacility is in Peterson and Reece (1994).

PROCEDURES
Fuel Production
The HySEE fuel production process utilizes 70 percent stoichiometric excess ethanol (absolute, 100
percent pure), or a molar ratio of 5.1: 1 ethanol to oil ratio. The total free fatty acids are determined
and neutralized with the calculated addition of catalyst. Based on the amount of input oil by weight,
1.3 percent of KOH is used plus the amount to neutralize the free fatty acids. The following
equations were used for the quantities processed:
EtOH = 0.2738 x Oil

KOH = Oil/85

where: Oil = desired amount of oil, in liters
EtOH = amount of ethanol needed, in liters
KOH = amount of potassium hydroxide required, in kg
The waste hydrogenated soybean oil is heated to 49 degrees Celsius (120 degrees Farhrenheit). The
catalyst is dissolved into the alcohol by vigorous stirring in a small reactor. The oil is transferred
into the Biodiesel reactor and then the catalyst/alcohol mixture is pumped into the oil and the final
mixture stirred vigorously for two hours. A successful reaction produces two liquid phases: esterand crude glycerol. Crude glycerol, the heavier liquid will collect at the bottom after several hours
of settling. Phase separation can be observed within 10 minutes and can be complete within twohours after stirring has stopped. Complete settling can take as long as 20 hours. After settling iscomplete, water is added at the rate of 5.5 percent by volume of the oil and then stirred for 5 minutes
and the glycerol allowed to settle again. After settling is complete the glycerol is drained and theester layer remains. Washing the ester is a two step process which is carried out with extreme care.
A water wash solution at the rate of 28 percent by volume of oil and 1 gram of tannic acid per literof water is added to the ester and gently agitated. Air is carefully introduced into the aqueous layer
while simultaneously stirring very gently. This process is continued until the ester layer becomes
clear. After settling, the aqueous solution is drained and water alone is added at 28 percent by
volume of oil for the final washing.
Engine warm-up and cool-down
Three different engine test protocols were followed using facilities at the University of Idaho. Eachtest started with a warm-up and ended with a cool-down period. The warm-up period consisted ofa two minute interval on D2 at low idle. Then there was an eight minute interval with the fuel to betested. During this eight minute period there is a gradual increase in load and RPM to the rated
horsepower and load. The cool-down period consisted of 10 minutes on D2 at low idle. For both
the warm-up and cool-down periods the return fuel line was placed into a separate container.

Engine Durability Screening Test
The two TS70C Yanmar engines used for the engine durability screening test were rebuilt prior to
the beginning of the 300 hour test. New cylinder liners, pistons, rings and rod bearings were
installed. The cylinder head was rebuilt and the head was thoroughly cleaned of all carbon deposits.
The engine oil was changed and sampled every 50 hours of operation. The oil samples were sent
to Cleveland Technical Center in Spokane, Washington for analysis. The engine valves were
adjusted at each oil change interval during the first 150 hours of operation.
At the end of the 300 hour test the engines were disassembled and inspected for evaluation of theeffect of the fuel on engine components. Coking of the pintle injector, precombustion chamber andpiston ring grooves were evaluated by inspection.
Emissions Testing
Two problems had to be overcome in developing a test design. The first was that the number ofpotential test runs was unpredictable. The test facility was scheduled for one week during whichtime all testing had to be completed. The second hurdle was a tendency for emissions to vary with
ambient conditions. A randomized block design with unequal sample numbers was developed. In
this design the main fuels were randomized and tested first and tests of fuel blends were included
in later tests in each block. As it turned out, sufficient time was available to test each fuel anddesired blends. Two runs of HySEE were included in the test design. The cycle used was the double
arterial cycle of 758 seconds duration. Five test runs were included on the same cycle using Phillips
low sulfur diesel control fuel. A Fisher’s Protected LSD analysis using SAS (Statistical Analysis
System) was carried out for the analysis of the data.
The emissions test procedure was as follows:
1. The test fuel delivery tube was connected to the input lines and the return line was connected
to a waste tank. The engine was started and run for 50 seconds.
2. The engine was stopped and the return line was connected to the test fuel tank.
3. The engine was restarted and idled for approximately 10 minutes until the MTA technicians
were ready to run the test.

4. The vehicle was operated under load until the operating temperatures stabilized.
5. The test was started and the cycle completed.
6. While the technicians were taking data, weighing particulate filters, etc., the fuel was
switched to the next fuel to be tested.

.

RESULTS
Fuel Production
Waste vegetable oil was obtained from the french fiy plant owned by Simplot, Inc., Caldwell, Idaho.
The waste oil was placed in drums and is solid at normal room temperatures. The oil is heated in
the drums by electric heaters and is then transferred into the biodiesel reactor for transesterification.
The ethanol-KOH mixture is added to the heated waste grease. The amount of ethanol and KOH
must be adjusted upward to account for vaporization of the ethanol as it is heated and the free fatty
acid content of the waste oil. Separation of the ester and glycerol is a constant problem. The final
product produced in these tests was found to be 92.26% esterified and contained 0.3% glycerine,
0.99% total glycerine. Monoglycerides were 1.49%, diglycerides 4.23% and triglycerides 0.99%.
Alcohol content was only 0.012%. The remaining catalyst measured 32 microg/gm.
Fuel Characterization
A complete summary of the fuel characterization data is listed in Table 1 for the HySEE and thereference diesel fuel used for this study. Some comparisons include:
Viscosity - HySEE had a viscosity 1.9 times that of D2.
Cloud and Pour Point - HySEE had a cloud point 19 degrees Celsius higher than D2
and a pour point 23 degrees higher than D2.
Sulfur - HySEE had 1.56 times less sulfur than the low sulfur diesel fuel used forcomparison.
Heat of Combustion - HySEE has 12.3 percent less energy on a mass basis than D2.
Since HySEE has a 4.1 percent higher specific weight, the energies average 8.2
percent lower on a volume basis.
HySEE has an apparent molecular weight of 306.95 compared to D2 at 198. As themolecular weight increases so do the cetane number and viscosity.
Injector Coking
A visual inspection of the injector tips would indicate no difference between the HySEE and diesel
fuel. However, the numerical scales show that diesel has an injector coking index of one and HySEE
has an index of 3.05 (for comparison in these tests, Rape Ethyl Ester had an injector coking index
of 3.16) The coking index is an average of three runs, four injectors for the four cylinder engine,
and two orientations for a total of 24 samples averaged for each fuel (Table 2). The overall injector
coking is low, especially when compared with older tests that included runs with raw vegetable oil.

Figure 1 shows a clean injector, an average coked diesel injector, and an average coked HySEE
injector.
Torque Tests
Figure 2 compares power and torque for HySEE and diesel fuel. HySEE has a 4.85 percent decreasein power compared to that of diesel at rated load. Peak torque is less for HySEE than for diesel but
occurs at lower engine speeds and generally the torque curves are flatter. At 1700 RPM the torqueis reduced 6 percent while at 1300 RPM it is reduced only 3.2 percent.
Percent opacity was 19 for diesel fuel at 1400 RPM and only 5 for HySEE at the same load. At the
rated load the diesel fuel produced 2.5 times higher opacity than HySEE.
The following table is the average of the completed tests at 1500 RPM.
HySEEDiesel

Opacity (%)

4.7

11

Power kW (hp)

44 (59.6)

46 (61.7)

Torque N-m&lb)

283 (209)292’(215)

Fuel Consumption kg/rnin(lb/min)

0.20 (0.45)

0.20 (0.44)

Fuel Consumption L/hr (gal/hr)

14.1 (3.72)

14.1 (3.73)

32.7

30.6

Thermal Efficiency (%)

At 1700 RPM the torque output for the diesel was 308 N-m (227 ft-lb) and 289 N-m (213 ft-lb) for
the HySEE.
Mapping Engine Performance
Figure 3 presents an engine mapping graph for diesel fuel and HySEE at 2500 RPM. Figure 4 is thefuel map for HySEE at each of the three RPM’s. Figure 5 is a graph of the thermal efficiency versus
brake mean effective pressure. Brake mean effective pressure (bmep) is the theoretical constantpressure which can be imagined exerted during each power stroke of the engine to produce power
equal to the brake power and is useful for comparing performance parameters in engines. For a
specific engine as used in these tests BMEP is directly related to power so these two graphs also
show the fuel consumption as a function of increasing power.

Engine Durability Screening TestHySEE Engine -- The initial power was set at 2800 watts with the engine operating at 2 100 RPM
under a load condition and 2250 RPM under a no-load condition. During the second night ofoperation the ambient conditions were such that the HySEE gelled and shut the engine down for
approximately two hours. A drum heater was added to the drum of fuel, a new fuel filter was
installed and the engine was restarted. On June 30, the circuit breaker tripped and 19.4 hours were
not logged on the hour meter. The engine was running at full RPM but was not loaded during thistime. Ten hours, about one half of the time the circuit breaker was tripped, was added to the end of
the test to compensate for the 19.4 hours for which there was no loading. On July 3 the engine shut
down again with the probable cause being cold weather gelling the fuel.
During the first one half of the test, when the engines were set at the same load, the engine highRPM under no-load condition was 2300 and under load was 2200 RPM. The engine produced a loadof 2820 watts and consumed fuel at a rate of 1.13 L/h.r (0.299 gph).
During the second half of the test, both engines were set at the same high RPM’s, the engine highRPM under no-load condition was 2270 and under load was 2140 RPM. The engine produced a loadof 2950 watts and consumed fuel at a rate of 1.14 L/In (0.3 gph). For the entire test a total of 340
L (90 gal) gallons of fuel were consumed and 309 hours were logged. The engine was shut down
and restarted twice for oil changes.
After completing the 300 hour endurance testing the engine was disassembled and inspected forwear and compared to the engine operating on 100% diesel fuel.
Diesel Engine -- The initial power was set at 2800 watts with the engine operating at 2200 RPM
under a load condition and 2300 RPM under a no-load condition.
During the first half of the test, when the engines were set at the same load, the engine high RPM
under no-load condition was 2300 and under load was 2200 RPM. The engine produced a load of
2820 watts and consumed fuel at a rate of 0.84 L/h.r (0.223 gph)..
During the second half of the test, both engines were set at the same high RPM’s, the engine highRPM under no-load condition was 2270 and under load was 2 160 RPM. The engine produced a loadof 2860 watts and consumed fuel at a rate of 0.85 L/h.r (0.224 gph). For the entire test 255 L (67.5
gal) of fuel were used and 302 hours were logged. The engine was shut down and restarted twicefor oil changes.
The HySEE fueled diesel engine consumed 25% more fuel than that of the diesel fueled engine. TheHySEE fueled engine shutdown twice, presumably due to cool weather, and produced a significantly
greater amount of visible exhaust smoke.

The engine oil analysis for the diesel engine indicated no abnormal conditions. The engine oilanalysis for the engine fueled with HySEE at each interval indicated no abnormal conditions except
at the 200 hour interval. The engine oil viscosity was reported as being in the SAE 50 range while
the base oil is 15 W-40. Figures 6,7, and 8 are graphs of the viscosity, iron and silicon versus engine
hours from the oil analysis. The higher iron concentration may be due to the higher siliconconcentration in the HySEE engine.
Engine Disassembiy
At the completion of the 300 hour endurance test the two engines were disassembled and inspected.
The first two piston ring grooves of the diesel fueled engine had slightly more carbon build-up than
did the HySEE fueled engine. The second two piston ring grooves were identically clean. The top
three piston ring groove surfaces for the diesel fueled engine showed more wear than the HySEE
fueled engine and the oil. ring (bottom ring) showed more wear. The piston rings were equally freein both engines. The deposits on the piston head were black to gray on the diesel fueled engine andblack for the HySEE fueled engine with each having equal amounts of carbon build-up. The HySEE
fueled intake valve had more deposits in the stem area than did the diesel fueled engine, other thanthat the intake and exhaust valves looked similar. No other differences in the engine components
were observed.
Emissions Tests
The summary data for the two 100% Hy SEE arterial tests and five 100% diesel tests are shown in
the following table.

On the average HySEE showed a slight reduction in NOx, a significant reduction in HC and CO, anda slight increase in PM and CO,. The PM data even though different was significantly variable that
it was not significantly different from diesel.,

CONCLUSIONS
A complete set of fuel characteristics for HySEE and diesel are presented. Performance tests
demonstrated that HySEE can be used to successfully fuel a diesel engine. In general, the testing
performed has shown that torque and power are reduced about 5 percent compared to D2 and fuelconsumption is increased 7 percent.
Specific conclusions of this study are:1. Fuel characterization data show some similarities and differences between HySEE andD2. a) Specific weight is higher for HySEE, viscosity is 1.9 times that of D2 at 40°C
(104”F), and heat of combustion is 12% lower than D2. b) Sulfur content For HySEE is
36% less than D2.
2. The average HySEE injector coking index was 3.07 and D2 was 1 .OO. Visually, allinjector coking was low especially compared with older tests that included raw vegetableoils.
3. Opacity was decreased by as much as 71 percent compared to D2.
4. At rated load, engine power produced by HySEE decreased by 4.8 percent compared to
D2.
5. Peak torque for HySEE at 1700 RPM was reduced by 6 percent compared to D2 while at
1300 RPM it was reduced only 3.2 percent, demonstrating a flatter torque curvecharacteristic of Biodiesel.
6. The average fuel consumption (g/s) on a mass basis was 7 percent higher than that of D2.
The differences in fuel consumption and power reflect the differences in heat of
combustion and density between the two fuels.
7. Thermal effkiencies for HySEE and D2 were not significantly different.
8. Emissions tests showed a 54 percent decrease in HC, 46 percent decrease in CO, 14.7
percent decrease in NOx, 0.57 percent increase in CO2 and a 14 percent increase in PM
when HySEE was compared to D2. The HC, CO and NOx differences were statisticallysignificant.

11

Acknowledgements
The authors express appreciation to the Idaho Department of Water Resources, Energy Division
who supported this project under contract #CON00172 and to the J.R. Simplot Co. for theircontributions of waste oil, ethanol, KOH and technical support.
References
Korus, R.A., J. Jo, and C.L. Peterson. 1985. A rapid engine test to measure injector fouling indiesel engines using vegetable oil fuels. JAOCS 62( 11): 1563-l 564.
Peterson, C.L., and D.L. Reece. 1994. Emissions tests with an on-road vehicle fueled withmethyl and ethyl esters of rapeseed oil. ASAE paper no.946532. ASAE, St. Joseph, MI.

12

Table 1
Fuel Characterization

Fuel Specific Properties

I

D2

Specific Gravity, 60/60
Vkcosity, cs @ 40°C
I- 3 dQ-12
ICloud Point, “C
Pour Point, “C-23Flash Point, I‘MCC.
.__- -, “C_I
74
Boiling Point, “C
191
Water and Sediment, % Vol. I<1 3.005
Carbon Residue, % mass
0.16
Ash, % mass
0.002
.$I
llfl It- ( %IAlt
YUI.II,“...

Cetane lumper
K ’Heat of Combustion, MJ/kg
Gross
.
Net
Copper Conce:^*.,-.-- --Karl Fischer kvarf

I
I

IHySEE

I

9
c

8

1

174

[

2‘-.7 3co.005
ni

,

V.“”

0~036
-.---

I , n “.“I
nl 4

4Y.Z

I

a- A

1

-_

I

61

45.42
42.9
1 4A

1

I

40.51
37.20
*A

IParti

II Analysis
Nitroge n, ppm
Carbon,1 o/nIVHydrogen, %Oxygen, % (by difference)
Acid Value

77

12.98
0.33
0.128
8.6

Indine Nllmber,,,:E, n..,,-d:-c.
Ester Sper;~~~r;
rrwpw ma
Percent Esterified
Free Glycerine, %wt
Total Glycerine, %wt

1273
I I.142
12.34
9.92
0.165
63.5

8fi
VW.“,67

I

I

I

I cl7

1

I

7G

-.-

Free FafIv Acids. %wt

Monoglycerides, %wt
Diglycerides,%wt

ialllrylai~~

1

I

3L

I

I

In?

Fatty Acid Composition, %Palmitir. I1 F;*nl

13

ITable 2
InjectorCoking

HvSEE 1

02 1

022

Data

Digitized
Digitized
Injector Injector Scale
Injector Scale
CokingNumber Diameter Factor
Area
Area
Index
1
15.1 0.000174
95.733
1.66
3.28
2
15.1 0.000174 97.7624
1.70
4.30
3
15.1 0.000174 92.4796
1.61
1.63
94.831
4
15.1 0.000174
1.65
2.82
15.1 0.000174
93.184
1.62
1.99
5
0.83
6
15.i 0.000174 90.8784
1.58
93.627
7
15.1 0.000174
1.63
221
8
15.1 0.000174 95.6852
1.66
325
15
0.000176
92.0291.62
2.03
1
15 0.000176 95.8446
1.69
3.98
2
15
0.000176
93.0705
1.64
256
3
1.65
2.78
4
15 0.000176 93.4903
1.68
3.91
5
15 0.000176 95.7044
1.67
3.62
6
15 0.000176 95.1493
1.55
-0.05
7
15 0.000176 87.9709
1.64
2.50
a
15 0.000176 92.9531
3.94
14.2
0.000196
85.8244
1.69
1
1.72
5.06
2
14.2 0.000196 87.7791
85.86
1.73
5.37
3
14 0.000202
14 0.000202 83.9996
1.70
4.28
4
14.1 0.000199 84.7793
1.69
4.03
5
6
14.1 0.000199 85.9545
1.71
4.71
1.59
1.27
7
14.1 0.000199 80.0059
8
14.1 0.000199 82.7917
1.65
2.88
1.65
3.05
Average of all HySEEinjecton
.l
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
a

14 0.000202 79.1211
14 0.000202 78.4036
14 0.000202
80.03814 0.000202 80.2352
14 0.000202 78.2346
14 0.000202 78.3805
77.18
14 0.000202
78.154
14 0.000202
15 0.000176 90.4685
15 0.000176 90.4177
15 0.000176
89.3528 15 0.000176
85.9857
15 0.000176
89.8264
15 0.000176
90.6138
15 0.000176
90.6756
15 0.000176
90.67414.9 0.000178
89.63414.9 0.000178
88.9961
14.9 o.oool7a88.6578
14.9 0.000178
87.8673
14.9 0.000178
88.633114.9 0.000178
87.98514.9 0.000178
89.5155
14.9 0.000178
88.7054
Average of all DZinjedon

14

1.60

1.58

1.62
1.62

1.58
1.58
1.56
1.58
1.59

1.59
1.57
1.51
1.58
1.59
1.60
1.60
1.60
1.59
1.58
1.57
1.58
1.57
1.60
1.58
1.58

1.41
0.99
1.95
2.07
0.89
0.98
0.27
0.84

1.23
1.20

0.66
-1.06
0.90
1.30
1.34
1.33
1.42
1.09
0.91
0.50
0.90
0.56
1.36
0.94,

1.00

Figure 1.

Typical injector coking photographs, clean (top), diesel (middle), HySEE (bottom).

65 %

,320

60
55
50

I/

45
40

3 5 J,

13bO

240

:

e

15bO

:

n

17bO

:

,

;

1 ;

t

19bO 21bO 23bO
RPM
- Diesel -F HySEE

;

I=

11220

25bO

Figure 2. Power and Torque versus RPM

,
0

2

I

1

I

4
bmep (bars)

I

I

6

+ Diesel + HySEE

Figure 3. Fuel Consumption versus bmep at 2500 RPM
16

I
8

b
5

4
3
2
1
,8
2

0

I
I
4
6
bmep (bars)* 2500 RPM + 2250 RPM+ 2000 RPM

Figure 4. Fuel Consumption versus bmep for HySee
at 3 RPM’s from Engine Mapping Test

30
g 25
5 20
5
2 15
LLI
; 10
ek 5
0
0

2

6

4
bmep

(bars)+ Diesel +- HySEE

Figure 5. Thermal Efficiency versus bmep
Data is from the fuel mapping test at 2500 RPM
17

8

Engine Hours

Figure 6. Engine oil viscosity
at 50 hour oil change intervalss.E 4 0
E
al 30
2
6 20

Engine Hours

Figure 7. Concentration of iron in engine oil analysis

10

IEE
Engine Hours

Figure 8. Concentration of silicon in engine oil analysis