Pumps, sulphur feed

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

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 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. 

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. 

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

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. 

The reactions were conducted in an open continuously stirrer tank reactor (CSTR) at room temperature, with a peristaltic pump supplying the feed solutions of potassium bromate, sodium sulfite, potassium ferrocyanide and sulphuric acid and also pumping out bulk solution to keep the volume in the CSTR constant. Measurements of pH were made using a standard gel-filled probe, and the output from the meter monitored by a PC. A typical pH profile is shown in Figure 1. 

Metering pumps instead of centrifugal pumps to prevent excess feeding of sulphur. 

The feed water pump is run intermittently only to maintain the water level in the flash drum (which is a separate unit), corresponding to the amount of water evaporated. Such steaming-type economisers can be seen in a sulphuric acid plant. 

Alumina hydrate (AH) (as powder or in bags) is taken up by a hoist and kept at charging floor. 98.3 % iron-free sulphuric acid is pumped to the day tank. Treated water is stored in feed tank. Measured quantities of acid and water are fed to the reactor at a controlled rate for a particular batch. There is rise of temperature due to the dilution of the acid. AH is slowly fed into the reactor. Steam is supplied (from WHRB or oil-fired boiler) to the reactor coils to complete the reaction. Samples of the product are taken and tested for purity if any unreacted AH is remaining. Steam is kept on for some more time. The hot product is drained out to mould and allowed to solidify (Table 16.2). 

Dilution of sulphuric acid and sending to feed tank for mixer (reactor) For reaction with rock phosphate If the dilution unit or transfer pump fails, the production rate is affected Keep sufficient spares ready always... 

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