This combined process package is used for the removal of tar, naphthalene, ammonia and hydrogen sulphide from coke-oven gas. From the cleaned gas, a stream is taken out to produce hydrogen for batch annealing furnace. The coke oven gas is first fed into a caustic wash tower, where the bulk of the hydrogen sulphide is chemically converted using caustic soda. The gas then passes through adsorbent beds, wherein tar and naphthalene are removed. The gas is then passed through a specially processed adsorbent to remove the balance hydrogen sulphide, down to less than 5 ppm.
The process gas is then compressed and fed to a hydrogen PSA to produce 99.99% pure hydrogen. This package is used in steel plants that operate a cold rolling mill and have coke batteries.
For other combined plants please contact us for further details.