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Ethylene Plant Steam Cracker Coil Systems
1.Standard:ASME,ANSI,ASTM,DIN,GB
2.Material:Alloy ZG40Cr25Ni35Nb,Hp-Nb+MA
3.Size:Dia.86/73X10820 or we can supply standard and nonstandard products as your requirement
4.Process:centrifugal casting
5.Quality:appearance of smooth,can work under presure for long time,advanced testing equipment to ensure thye quality,
6.Packing:Wooden box ,sea-worthy plywood pallets with polyethylene film or steel cases or as customers request.
7.Delivery time:30 to 60 days after we signed SALES CONTRACT.
8.Port of departure:Shanghai,Dalian;Qiangdao etc.
9.Certification:ISO9001:2008
10.Payment:L/C,T/T
11.Application:Used for Da Qing Petrochemical Company 1,200,000 Ton/Year Ethylene Plant.
Commercial furnaces
Thermal cracking of hygrocarbons is accomplished in tubular reactors commonly known as cracking furnaces,crackers,cracking heaters,etc.
Several engineering contractors,including ABB Lummus Global, KBR,Linde,Stone and Webster(a Shaw Group Company),and Technip offer cracking furnace technology.
ABB Lummus Global it's produce ethylene for polymerization with purity 99.95% vol. Feed is heated and cracked in the presence of steam by tubular furnace,outlet temperature 815-870°C.Special construction of the coils of this furnace guarantee short residence time that why this furnaces callwd SRT.
Kellog Brown &Root propose wide choice of feed which can use in it's furnces from ethane to vacuum gas-oil.This furnace called SCORE,hve straight coils,short residence time about 0.1s nd low working pressure.Special construction furnace guarantee high outlet of olefinc hydrocarbons.
Two cracking furnaces may share a common stack, and the height of the heater may vary from 30 to 50m.
Before the 1960s,cracking tubes were rranged in horizontal rows in a radiant chamber,leading to low ethylene capcity(20,000 mta,metric tonnes per annum).Modern designs use tubes arranged in vertical rows,providing superior mechanical performance and higher capacity.Today,the cpcity of single cell furnace is well over 150,000 mta.
Pyrolysis heater radiant coil characteristics(single heater range)
Number of coils | 2-176 |
Coil length,m | 9-80 |
Inside coil dimeter,mm | 30-200 |
Process gs outlet temperature,°C | 750-950 |
Clean coil metal temperature,°C | 900-1,080 |
Maximum metal temperature,°C | 1,040-1,150 |
Average heat absorption,kw/m2 external area | 50-120 |
Bulk residence time,s | 0.1-0.6 |
Coil outlet pressure,KPa | 150-275 |
Clen coil pressure drop,KPa | 10-200 |
Ethylene capacity,mta | 20,000-250,000 |
Ethylene Plant Steam Cracker Coil Systems