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Enron Mail |
1. What are the short term NOx and CO emissions during startups, and are
there limitations during start-ups. Normally, there is a short period during startup when the NOx goes to approximately 35 ppm. This is very short in duration and occurs while the gas turbine is loading. Our site is permitted to normally operate between 70-100% turbine load. These emissions have subsided within the few minutes required to attain 70% load. Our permit constraints require that we do not exceed our emissions limits on a 3 hour rolling avarage. Therefore these short-term startup emissions are not an issue. CO is a calculated value. I do not have short-term CO2 numbers at present. However, I don't believe they are at issue since they are related to excess air which is pretty high during startup. There is a condition called lean-lean firing which can and has occured from time to time. A transition takes place above 40MW when the nozzle gas arrangement normally goes to a firing state called "premix steady state." If this transition fails for some reason, the machine goes into a lean-lean state and the NOx level can rise to 40-50 ppm. The turbine activates and operator alarm when this happens. We can count the number of occurances that this has happened on one hand at Caledonia. When this conditions occurs, the operators correct the condition by reducing the load to about 35MW and then increase the load again. Typically this resolves the faulty transition and it configures the nozzles correctly on the second attempt. 2. Are industrial stormwater permits required at either site? No industrial stormwater permit is required at Caledonia. 3. In Caledonia, what is the custom fuel sampling schedule? The fuel sampling schedule for both sulphur content and heating value at Caledonia is once per month. Regards, Pat Cathers ---------------------- Forwarded by Jon Cathers/Corp/Enron on 12/04/2000 10:47 AM --------------------------- Benjamin Rogers@ECT 12/04/2000 10:28 AM To: Jon Cathers/Corp/Enron@Enron cc: Subject: Question 2 Jon: Here are some more questions regarding the Caledonia plant. Your assistance with these questions would be greatly appreciated. Please send your answers back to me when completed. Again, thank you for your help. Regards, Ben 3-7998 ---------------------- Forwarded by Benjamin Rogers/HOU/ECT on 12/04/2000 10:27 AM --------------------------- Don Miller 12/04/2000 10:11 AM To: Benjamin Rogers/HOU/ECT@ECT cc: Subject: Question 2 ---------------------- Forwarded by Don Miller/HOU/ECT on 12/04/2000 10:10 AM --------------------------- "Tang, David" <dtang@Cinergy.com< on 11/30/2000 07:45:51 PM To: "'don.miller@enron.com'" <don.miller@enron.com< cc: "Whitehead, Robert" <rwhitehead@Cinergy.com<, "Hoyos, Sergio" <sergio.hoyos@cinergy.com<, "Chaney, Tom" <tchaney@Cinergy.com<, "Vivar, Art" <avivar@Cinergy.com< Subject: Question 2 More Questions: Both Plants 1. What are the short term NOx and CO emissions during startups, and are there limitations during start-ups. 2. Are industrial stormwater permits required at either site? Caledonia 3. In Caledonia, what is the custom fuel sampling schedule? Brownsville 4. What is the agency's response to the Enron letter regarding the 2nd stormwater NOV? 5. Has there been any further action by the agency since the 1st stormwater NOV was never responded to? 6. One memo stated that the stormwater is channeled to a wetland. Was that during construction only or is it ongoing? 7. Were there any further problems with the B T Readymix concrete dumping issue?
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