WSP10774

• File Number: 8271.200
• Description: Colorado River Basin Salinity Control Program - Development and History - UCRB 13a Assessment
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1979
• Title: Costs of Wastewater Disposal in Coal Gasification and Oil Shale Processing
• Water Supply Pro - Doc Type: Report/Study

retort. The s~e~ is ~sed p=imarily :or upgrading with steam levels of 50,
-4 150 and 600 psg. Approximately 370 gpm (= 600 acre-ft/yr) of boiler makeup is

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required for the 50,OCO barrel/day White River design or 420 gpm (= 680 acre-
ft/yr) for a plant producing 50,000 barrels/day of synthetic crude. In the
proposed design t~e blowdown from the ion ex=hange units are fed to a storage
tank and then used to moisturize the spent shale.
As is pointed out in Section 2.3.2, the blowdown streams are from a to 15
percent of the product water volume and the waste~ater concentration is about
2 to 2.5 percent total dissolved solids.
3.3.2 Coolina Tower Slowdown. Although some retorting processes :equire
little or no water for cooling. as for example the ?araho direct process,
cooling ~ater is ~equired to dissipate waste heat generated pr~rnaril'l in the
upgradir.g operation. Estimates of the overall ccn~ersion efficiencj, the
ur.recovered heat removed by wet coolins, and ~he total water evaporated in an
oil s~ale complex for cooling, including ~hat for retorti~g, is given in Table
3.1. ~he values are ~aken frcm Reier~nce ~ anc are based en heat calance
calculations mace from the ?araho1 and Tasca II2 cesigns.

TABrz 3.1 UNRECOVERED HEA::: RECO'."EP.ED BY WET CCCLI:-IG, OVEF.;u. CCNVERSION
::FFICIENey A.'lO WATER EVAPORATED IN A..'1 OIL SHAU: n..A..'1T PRODUCING
50,000 BAlU'.EL/!lAY SY~lTHETrC CRUDE

paraho Direct

O"'.rerall
Conve=sion
Efficiency
("I

71

57

69

28
19
18

Fraction of
Unrecovered Heat
to Evaporate
Wa~er (")

flat:er
Evaporated
for Cooli:lg
(crom)

2320

2660

1700

Paraho Indirect
Tasca II

The complete water management flow diag~arn for the Tasca II p~ocess,
shown in Figure 3-3, gives evaporation and drift losses equal to 1530 gpm (=
247 acre-ft/yr) for ~he 50,000 barrel/day design or 1630 gpm (= 2620 acre-
ft/yr) Ear a mi~e-plant complex producing 50,000 barrel/day of sY:lthetic
crude. as =cropared ~o t~e value of 1700 gpm shown in Table 3.1. These values

are consistent ~i~~ those founc i~ ~e=~rence 5. Th~ eva9or~ticn and c=if~

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