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Dołączył: 13 Gru 2010
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 Wysłany: Czw 0:31, 30 Gru 2010 Temat postu: Catalyst for ammonia decomposition process improve |
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Catalyst for ammonia decomposition process improvement life extension
Ammonia decomposition catalyst device uses a heat technology, that is,ghd glätteisen salon, restore the atmosphere, ammonia and hydrogen cyanide by high-temperature catalytic decomposition into nitrogen, hydrogen and carbon monoxide. For ammonia decomposition furnace is the core equipment, only the value of the furnace to the catalyst loading up to 100 million,p90x workout schedule, and in ensuring the efficiency of ammonia decomposition under the premise of how to extend the life of the catalyst, it is the focus of our daily work. 1 causes the loss of ammonia decomposition catalyst we use ammonia decomposition catalyst is magnesium oxide as the carrier, nickel is the main active ingredient. Production practices that result in the ammonia decomposition catalyst loss during the following aspects of reasons. (1) Although the decomposition of ammonia to be carried out at high temperatures, but temperatures above 1200 ~ C, the vapor pressure is too high and will speed up the nickel-nickel loss. When the temperature is lower than 900 ~ C when the catalyst is prone to produce ammonium salts of sulfur poisoning or blocking the catalyst, a direct impact on the life of the catalyst. (2) production operations, fluctuations in temperature and gas composition changes easy to make locally produced carbon catalyst surface temperature,mbt schuhe günstig, resulting in a large number of volatile nickel and shorten the life of the catalyst. 2, the problems of ammonia decomposition process (1) the active component of the new catalyst is nickel oxide, the temperature needed before using the restore operation. But in 1998, during the period 1 calciner oven, gas volume due to loss of control resulting in rapid heating rate, resulting from the plan 70h oven time shortened to 50h, the catalyst reduction effect due to poor affect their life. (2) ammonia decomposition furnace control systems require a higher level of automation, ammonia decomposition plant put into operation in 1994, because of control problems and frequent instrument system downtime, resulting in unstable furnace conditions, shortening the life of the catalyst. (3) The ammonia vapor corrosion and blockage of ammonium plus thermocouple by the catalyst under high temperature extrusion, easily damaged parts,moncler jackets, resulting in ammonia gas systems have a greater error of the instrument is difficult to accurately control of furnace conditions. (4) short-term shutdown of ammonia decomposition device, the ammonia gas directly into the raw gas pipe, the system resistance decreased, the temperature dropped at the top of Ammonia, Received Date :2002 -12-05 ammonia vapor water content increased. Start again when the ammonia decomposition device, is easy to occur due to ammonia gas with water to affect a large number of catalyst life. 3 improvements (1) gas pipe in the 150 additional traffic control 50 to control the amount of gas during baking, and in strict accordance with the heating curve heating up. 1999 and 2000, two ovens practice shows that the reduction of the catalyst _ very satisfactory results. (2) June 2000, in the ammonia decomposition device in the control system additional indicators of several interlocking bypass procedures, ignition system will be changed to the control room, fire control cabinet to cancel the scene to improve the stability of the system reduce the number of stops. (3) the addition of quartz thermocouple protection tube, while the ammonia vapor temperature and the roof temperature and other key indicators measured using the effective combination of measurement and instrument approach, the roof temperature at 1100-1150 ~ C, effective stabilize the calciner furnace conditions. (4) For the catalyst after the compaction, separation, drying and screening the regeneration treatment. In October 1998, we removed from the furnace 2, a catalyst for regeneration, and in April 1999 to re-use, ammonia decomposition furnace gas in the ammonia down to 0 by the 0.67g/m3. 19g/m3. (5) short-term suspension in ammonia decomposition furnace, the appropriate increase in the temperature of the top of Ammonia and ammonia vapor in the start time of operation of the subretinal fluid in order to reduce the water content of ammonia vapor. 4, the original production process improvements to take effect on the improvement measures, achieved the desired results. No. 2 furnace as a catalyst for production since May 1999 after 18 months of continuous use, the cumulative use time of up to 30 months, the actual use of time exceeds the allotted time for 6 months. Through the furnace in the No. 1 catalyst for a 12-month comparison of decomposition results obtained to improve before the ammonia decomposition furnace gas in the ammonia content of 0.67g/m3. The improved ammonia gas in the down 0.3g/m3. Also, as content of ammonia decomposition furnace gas reduction,Ed Hardy outlet, exhaust gas corrosion of pipes and equipment also will be reduced, exhaust pipe of the replacement cycle is extended from 2 to 4 years, only a material cost savings of nearly 10 million.
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