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PT Krakatau Posco Cilegon (Indonesia)
New greenfield cokemaking plant
Coke Oven Technology
PT Krakatau Posco – New greenfield cokemaking plant, Cilegon (Indonesia)
Project description
In the frame of its integrated mill project at Cilegon, Indonesia, the Korean-Indonesian steel-maker PT Krakatau Posco had charged in early 2011 a Consortium established among Paul Wurth Italia, Paul Wurth International Site Services, Posco Engineering & Construction, PT Krakatau Engineering and PT Posco E&C Indonesia with the construction of its greenfield coking plant. Com-prising two coke oven batteries and all related gas treatment facilities the coking plant is designed for a yearly production of 1.3 million tonnes of coke.
Paul Wurth was contracted for the complete engineering and supply of key components for the two new batteries of top charging type, the coal tower, the coke quenching tower, the coke wharf as well as the complete by-product recovery plant realised in cooperation with DMT GmbH. The Group also supplied on-site supervision during the erection, commissioning and start-up activities.
After exemplary project execution, the new coke oven plant was successfully started on 9 October 2013 – just 30 months after contract award. With this large-scale project, Paul Wurth adds an-other strategic reference to its portfolio of coke making plants.
Coking Plant & Production Data
Coke production: 1 .32 million tpy
Coke oven batteries: 2
Number of ovens: 42 (each battery)
Oven dimensions: Length : 20 m
Height : 6.25 m
Width : 0.55 m
Useful volume : 78.92 m3
Machine sets: 2 (1 in stand-by)
Coke Oven Batteries
After heating-up of battery N°2 was started on 11 June 2013, the first coke was successfully pushed on 9 October 2013. Two months later, battery N°1 was also put in operation.
Both batteries feature “state-of-the-art” coking technology:
` Paul Wurth batteries based on “Jumbo Oven Bat-tery” concept, allowing to minimize the pushing per day and consequently to reduce emissions;
` Twin-flue design with 38 heating flues for each heating wall;
` Asymmetrical configuration with mixed gas and air on the pusher side and waste gas on the coke side;
` Minimised NOx emissions through waste gas recirculation, three steps of staggered air inlet, underjet type for coke oven gas underfiring;
` SUPRACOK™ Level 2 automation.
Coke oven battery N°1
Primary gas coolers of indirect cooling type
Coke Oven Technology
Quenching Tower
The quenching tower is of Paul Wurth LOw MOis-ture type. With a height of 45 meters, the RCC construction is lined internally with anti-acid clink-er bricks and fitted with a wide steam outlet area, so as to reach low steam outlet velocity and a low dust output. In order to wash the water steam generated during the process and to capture the coke particles carried over by the steam, the quenching tower is equipped with a dust catcher system on two different levels and a steam wash-ing system. The settling basin is equipped with a grab crane for coke dust removal and coke boxes for final filtration.
Gas Treatment Plant
The gas treatment plant for cleaning the coke oven gas and recovering by-products is designed for a COG flow of 88 000 Nm3/h. It includes:
` 5 primary gas coolers of indirect cooling type
` 2 tar decanters of vertical type and conical bottom
` 3 coal water gravel filters
` 2 electrostatic tar precipitators
` 2 gas exhausters
` a H2S scrubber, a NH3 scrubber and a combi-scrubber
` a benzene (BTX) scrubber
` 2 deacidication columns, 2 ammonia stills columns and a related solidification unit
` a benzene (BTX) stripper
` a Claus plant for sulphur recovery
Pushing per day: 82.3
Coke per oven: 44 t
Gas Treatment Plant
Coke oven gas production: 78 000 Nm3/h
Low heating value: 4 185 Kcal/Nm3
Tar production: 79 000 t/y
Benzene (BTX) production: 21 000 t/y
Solid sulphur production: 4 400 t/y
Overall view of gas treatment plant
Scrubber facilities
The Paul Wurth Group is today one of the world leaders in the design and supply of complete plants, systems and processes as well as specialised mechanical equipment for
� the iron & steel industry: Blast Furnaces & Auxiliary PlantsCoke Making PlantsAgglomeration Plants Direct Reduction PlantsEnvironmental Protection, Recycling & Energy-Saving Technologies
� other industries:Systems & Equipment for Non-Ferrous Pyrometallurgy, Electrometallurgy & Residue TreatmentIntralogistics Solutions for Heavy LoadsEngineering & Project Management for Civil Construction and Infrastructure Projects
Feasibility Studies – Conceptual, Basic and Detail Engineering – Project Management – Plant and Components Supply – Turnkey Projects – Assistance in Plant Assembly and Commissioning – Technology and Operations Consultancy – On-site and Remote Operational Assistance – After-sales Services
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BUREAU VERITASCertification
N° BXL 05000141 / N° BEL BXL 153669
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