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High Pressure Boiler 75kg/cm2 Water Parameters in Sugar Plant

Date: 05-22-2017 Author: ailsa from ZG boiler

Sugar plants, when they go in for cogeneration have to install high pressure boilers of 66ata and above with a definite aim to generate surplus power for feeding to the grid. High pressure boilers with 75kg/cm2 are normally designed close to the limiting conditions of the heat transfer, tube metal temperature, circulation etc. to make the units compact and economical.

The principal problem in modern high pressure boilers is the control of corrosion and steam quality. Internal corrosion and deposition may cost the sugar plants lakhs of rupees in repairs and lost availability. Modern steam turbines rated for high capacities call for stringent steam quality to avoid damages. Without strict control of impurities in steam, deposits will be formed over turbine blades and nozzles and output will be reduced. Thus the successful operation of high pressure boiler / turbine units require a thorough understanding of the aspects of water treatment.

High Pressure Boiler 75kgcm2 Water Parameters in Sugar Plant

Water treatment is very important in high pressure boilers to protect the system from corrosion, scale and deposits. Total solids and silica are required to be maintained at low levels in drum water at high pressures to maintain desired steam quality. Silica, in particular, is carried over in the form of a vapour at high pressures and the amount of silica needs to be maintained very low for example at less than 0.4 ppm at a drum operating pressure of 75 kg/m2(g).

Feed water is used as desuperheating spray and any contamination or feed water directly enters superheated steam. Impure feed water increases blow down which is uneconomical. Hence feed water is to be very pure for high pressure boilers. This, in turn, necessitates high purity for make-up water. Demineralisation can only produce acceptable make-up quality for high pressure boilers of the order of specific electrical conductivity less than 0.5 mmho/cm with hardness completely removed and silica less than 0.02 ppm. When dissolved solids are removed by demineralisation, suspended solids, organic matter and turbidity are to be removed in the pretreatment stage normally comprising of chlorination, coagulation, clarification and filtration. The removal of suspended impurities is important for efficient operation of demineralised and to avoid problems inside boilers.

Keyword: Industry steam boiler,High Pressure Boiler, Boiler 75kgcm2 Water Parameters, Boiler in Sugar Plant

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