Sulphur feed

A sulphur feeding pump of 1000 litres per hour capacity can operate a sulphuric acid plant of 40 to 100 tonnes per day capacity. Hence, a pump purchased for a 40 tonnes per day plant can be used even when the production capacity is to be increased up to 100 tonnes per day. ... 

Sulphur Furnace and Vestibule Fixed and roller supports, inner air distribution, peepholes and manhole position, location of thermocouples, hydraulic tests for sulphur feed line, and sulphur spray gun for the furnace ... 

Start circulation of alkali solution in scrubbers. Sulphur feeding to be started only when converter passes have been heated up to their ignition temperatures by suitable means (oil firing or other means). Start with low air and sulphur feed rates only. Bypass the waste heat recovery boilers partially in the first few hours tiU all the system temperatures have been normalised. Gradually increase the air flow and sulphur feeding to increase the production rate. Operate the oleum and SO3 systems to produce them as per demanded by customers/as advised by marketing department. 

The plant is run with as much airflow and sulphur feed as possible just a few days before the shutdown. All temperatures, SO2 % at inlet to converter and in exit gases, are checked. Airflow rate, pressure drop in each unit on gas side, and load on each motor are also checked. Any abnormality is noted down, and planning is started to correct it. 

Sulphur melters and keeping sulphur feed lines and pumps warm,... 

Start steam supply in sulphur feed lines, sulphur pump, and spray gun. 

Adjust dampers in airlines and start air blower on low load—check whether gases are observed through bypass line on sulphur pump discharge to confirm the sulphur feed line is clear. 

Slowly raise airflow and sulphur feed to reach required production rate. 

Sulphur feeding pumps Sulphur feeding Production can stop Install spare sulphur pump... 

Sulphur feeding continued even when air supply is stopped Accumulation in furnace may cause explosive conditions carryover of un burnt sulphur may cause problems in downstream units Sulphur pump should stop when air blower stops Check interlock with blower at least once every week... 

Excess feedlLess feed Provision of metering pumps for controlled sulphur feed to prevent excess or less feed. 

Less/no flow of feed water to boiler—Provision of electrical interlocks for tripping of air blower (and consequently the sulphur feed pump also) when water level is very low in WHRB when there is very less or no flow of feed water to the boiler. 

At the sulphur feed point, a steel grid with 6" square openings is installed over one end of the melting compartments as a safety device and to screen out large lumps of tramp material. 

Metering Pumps are provided to ensure steady Sulphur feed to the burner. This... 

An example where reactant concentration is solely governed by corrosion considerations is in the production of concentrated nitric acid by dehydration of weak nitric acid with concentrated sulphuric acid. The ratio of HN0j H2S04 acid feeds is determined by the need to keep the waste sulphuric acid at > 70 Vo at which concentrations it can be transported in cast-iron pipes and stored after cooling in carbon-steel tanks. 

Ninety-eight per cent sulphuric acid is pumped at 4.5 tonne/h (1.25 kg/s) through a 25 mm diameter pipe, 30 m long, to a reservoir 12 m higher than the feed point. Calculate the pressure drop in the pipeline. 

Sulphur dioxide produced by the combustion of sulphur in air is absorbed in water. Pure S02 is then recovered from the solution by steam stripping. Make a preliminary design for the absorption column. The feed will be 5000 kg/h of gas containing 8 per cent v/v S02. The gas will be cooled to 20°C. A 95 per cent recovery of the sulphur dioxide is required. 

Froslie, A., G. Norheim, and N.E. Soli. 1983. Levels of copper, molybdenum, zinc, and sulphur in concentrates and mineral feeding stuffs in relation to chronic copper poisoning in sheep in Norway. ActaAgric. Scand. 33 261-267. 

---