Coker furnaces are used during the refining process of crude oil to manufacture gas. This process involves high temperatures, vibration, corrosive atmospheres, and a volatile environment. This in turn creates a high risk to the environment, and a high cost if a process in lost or has to be burned off.

In order to achieve optimum conversion in a synthesis convertor, it is necessary to purge a certain quantity of gas from synthesis loop so as to as to reduce inerts concentration in the loop. This purge gas containing about 60% Hydrogen was fully utilised as primary reformer fuel. A cryogenic purge gas recovery unit is used to recover H2 from it which is recycled back convert it to Ammonia while the by - product tail gas from PGR Unit is burnt as fuel in the primary reformer.

At times, extremely tall cylinders are constructed to perform purge gas recovery operations. Typically, thermocouples are installed to monitor inlet and outlet gas temperature of each bed (bottom) of these cylinders.

In the modified system LT Shift Converter effluent is cooled in the condensate Reboilers via heat exchange with CO2 Stripper water wash condensate. Low pressure steam is generated and is utilised as motive steam for flash drum ejectors. The semilean solution is taken to a flash tank. The pressure is reduced in successive stage resulting in a move complete flashing of the stream water. A temperature drop of 121 deg C to 111 deg C result. The flashed steam is compressed by the motive steam in the ejectors & reintroduced in the stripper. This stream of flashed & motive steam is used to provide a portion of the required regeneration heat.copywrite www.thermometricscorp.com, Dan Dobbs.

Before incorporation of the scheme, the waste water containing about 4 - 5 % of Ammonia & 0.3 % of Urea is pumped by Distillation tower feed pump to Waste water distillation column, where the ammonia is stripper off. The stripping vapours are regenerated by boiling the purified water in a re-boiler heated with steam. From the re-boiler the treated water was cooled and sent to battery limit. After incorporation of hydrolyser the feed for hydrolyser is taken from 21st tray of the distillation column. Before entering the hydrolyser the solution is preheated in a heat exchanger by means of solution coming from hydrolyser itself. The hydrolysis heat is provided by HP Steam. The solution leaving the hydrolyser after passing through the exchanger is sent to distillation column. From the distillation column the water is cooled and then sent in the cooling tower as make - up.copywrite www.thermometricscorp.com, Dan Dobbs.