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OAR Box 1781 

Prepped by Ollie Stewart 

Document Number: 

22) 11-1-14 

Docket Number: 

A-90-37 

Printed 10/29/2008 10:46:19 AM Sheet 22 of 142 
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IVJALCOLM JONES ASSOCIATES 

25401 Cabot Road, Suite 107 

Loguna Hills. CA 92653 

714-770-0775 

FAX 714-770-8950 

i-M' rTTSan Zunich 

Cimarron Chemical Corporation 

1400 Post Oak Boulevard, #625 

Houston, Texas 77056 

March 14, 1989 

Dear Dan: 

Pursuant to your vequest, we have made a sjjfttrt study of the 

potential COSt impact which would occur if the Cimarron Chemical,- Baca 

County, Cogeneration Facility wad required to meet 75 ppm or 42 ppo 

NOx levels by increasing the injection levelc of high pressure steam 

into the combustion chambers of the gas turbine generators over the 

atesra injection levels required to achieve 100 ppm NOx. 

Our report is attached. 

Sincerely, 

MSJ/je 

Enclosure 
THE-COST IMPACT Of VARIOUS LEVELS Cf STEAM INJECTION FOR NOx CONTROL 

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To examine the cost impact of various levels of steam injection for urii 

control on the Cimarron Cogeneration prnfort oi. .*•.... c 

s 1U project, simulations were performed to 

determine the effects on overall system performance. It was assumed that 

steam injection, adequate to achieve a level of 100 ppm NOx in the exhaust, 

was the baseline for system performance. This would correspond to the 

injection of about 4425 lbm/hr of 650 psia steam into the combustion chamber 

of each combustion turbine when the net system output as a combined cycle is 

68,000 kw". Cases were then run for the conditions where the NOx levels were 

projected to be 75 ppm and 42 ppm. 

The following are various system parameters for the three conditions: 

Parameter 

Power Output - ku 

Steam Injection - lbm/hr 

Fuel Consumption - MBtu/hr 

Make-up water - gpm 

100 ppm 75 ppm 42 ppm 

67,922 

8,850 

503 

21 

67,931 

13.442 

509 

38 

67,913 

41.728 

519 

87 

The most strik-ing impact is the additional fuel cost for the same power 

output. An increase in fuel consumption required to -achieve 42 ppm, 16 

M8tu/hr, is an added cost of $40.00 per hour if the fuel is valued at 

$2.50/H8tu. 

In addition to increased operating costs, the requirement to reach lower 

NOx levels would also impact the plant capital cost. The requirement for more 

injection steam will require an increase in the water treatment capacity, 

larger sized pumps, larger sized water and steam injection lines, and larger 

items of equipment such as desuperheaters. 

for example, the requirement to add another 66 gpm of water treatment 

capacity would add an estimated $247,500 to the cost of the plant for water 

treatment equipment alone. In addition to the cost of the water treatment 

equipment, the steam injection system will have to be increased in size. This 

will require the desuperheaters for the injection steam to be two sizes larger 

and the stainless steel piping to the steam injection skid to be double the 

baseline diameter. The estimated increase in cost for 500 feet of larger 

stainless steel pipe is about $10,000 and the estimated additional cost for 

larger desuperheaters is $6,000, based on quotations received for similar 

equipment, in addition, .the carbon steel water piping must be larger and 

bigger water transfer pumps must be'installed.