LARGE SCALE AMMONIA STORAGE AND HANDLING DAN WEBB MGR., ENG. & TECH. SVCS. CF INDUSTRIES, INC. LONG GROVE, IL
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1 LARGE SCALE AMMONIA STORAGE AND HANDLING DAN WEBB MGR., ENG. & TECH. SVCS. CF INDUSTRIES, INC. LONG GROVE, IL 1
2 Presentation Overview Why are these facilities needed? Why is refrigeration needed? What are the major components? How is ammonia transported to and from the facilities? What are special challenges and opportunities? 2
3 Why are these facilities needed? Ammonia is a very concentrated form of nitrogen fertilizer for agricultural crops Shipping demands to local supply centers and farms is short duration and high volume Ammonia is produced continually and must be stored until needed Physical properties of ammonia demand high pressure storage vessels or refrigeration 3
4 Why is refrigeration needed? A typical facility stores from 15,000 to 60,000 tons of ammonia to meet shipping needs Full pressure, shop fabricated, storage vessels are practical to about 300 tons (you would need 50 to 200 per site) By storing ammonia in a refrigerated state, very large tanks are practical (as high as 17.5 million gallons) 4
5 Why is refrigeration needed? (cont.) Ammonia, in addition to being a good fertilizer, is a good refrigerant By keeping the stored product temperature low, the pressure stays low By keeping the stored product pressure low, the temperature stays low (-28F at 0 psig.) 5
6 Major Components 126 to 170 ft. in diameter 60 to 105 ft. high Low Pressure Storage Tank (LPST) 6 to 12 million gallon capacity (15-30,000 tons) usually 1 psig max. internal pressure (~-28F) heat leaks in from environment 6
7 7
8 Major Components (cont.) Compressor moves vapor, increases pressure reciprocating, rotary screw, rotary vane, etc 10 to 300 horsepower each (75 to 1200 hp total) compression ratio dependent on type required capacity dependent on inbound type compression causes temperature increase 8
9 9
10 Major Components (cont.) can be vertical or horizontal vessel usually designed for 250 psig. provides direct contact cooling removes superheat from vapor vapor out vapor in liquid in liquid out Flash Tank or Intercooler 10
11 flash tank 11
12 Major Components (cont.) can be air-cooled, evaporative, or shell-andtube usually designed for 250 psig. removes superheat and latent heat changes vapor to liquid Condensers 12
13 vapor in water in liquid out evaporative condenser water out 13
14 Major Components (cont.) liquid in liquid out usually a horizontal vessel usually designed for >= 250 psig. provides liquid seal provides surge capacity Receiver 14
15 15
16 Refrigeration in an Ammonia Storage Facility 16
17 Superheated vapor passes from the storage tank to the 1st stage of compression. Vapor is compressed from less than 1 psig. up to psig. 17
18 Hot vapor from 1st stage compression is cooled in the flash tank in preparation for 2nd stage compression. 18
19 Vapor near its saturation temperature passes to 2nd stage compression. Vapor is compressed from psig up to condensing pressure of 150 to 225 psig. 19
20 Hot vapor passes to the condenser, where heat is rejected to the environment. 20
21 Condensed ammonia gravity drains into the receiver. 21
22 Receiver level control sends liquid to flash tank for an intermediate flash on its way back to the storage tank. 22
23 Flash tank level control sends liquid, at intermediate pressure, to the storage tank. 23
24 A flare for burning of ammonia vapor during a refrigeration system interruption and a knockout pot to protect the compressors from damaging liquid entry are also utilized. This completes the holdingrefrigeration system. 24
25 Ammonia Inbound to a Storage Facility 25
26 Cold Inbound Refrigerated Barge/Ship Cold inbounding of ammonia is done by pumping directly to the storage tank (250 to 750 tons per hour) Refrigeration 26
27 Warm inbounding of ammonia can be done by taking the product directly to the storage tank. Warm Inbound Rail Truck Pipeline Refrigeration 27
28 Instead,warm inbounding of ammonia is usually done by passing the product through the flash tank to increase efficiency. Rate is limited by refrigeration capacity (usually 5-20 tons per hour). Warm Inbound Rail Truck Pipeline Refrigeration 28
29 A high pressure bullet is typically used to provide surge capacity for warm product inbounding (100 to 300 tons). Warm Inbound Rail Truck Bullet Pipeline Refrigeration 29
30 Cold Inbound Warm Inbound Refrigerated Barge Rail Truck Pipeline Bullet Refrigeration 30
31 Ammonia Shipping 31
32 Rail Truck +40F Low Pressure Storage Tank -28F Natural Gas Cold ammonia must be heated before loading onto trucks or rail cars. 32
33 Rail Truck Warm Inbound Bullet Warm, high pressure ammonia +40F Low Pressure Storage Tank -28F Natural Gas Warm ammonia from inbound can be loaded directly onto outbound vehicles or mixed with heated product for shipping. Direct transfer saves refrigeration and heating energy if the facility has a bullet. 33
34 Rail Rack Compressor Building 30,000 ton storage tanks Bullet Truck Loading 34
35 Challenges and Opportunities Ammonia stinks! (that s good and bad) Storing millions of gallons of ammonia presents environmental, health, and safety concerns. PSM and RMP very much affect this industry. Ammonia handling is very energy intensive and competitive. 35
36 Challenges and Opportunities (cont.) Energy prices are hitting ammonia manufacturing and handling very hard! Many of the facilities were built in the 60 s and 70 s and need to be upgraded to newer technology. 36
37 Questions/Comments? 37
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