Having eight years of experience working with biomass-fired boilers in palm oil mills, I can say that boiler water treatment in palm oil mills is a challenging task if compared with industrial boilers. Unlike industrial boilers which rely heavily on condensate return and industrial water for boiler feed water makeup, the source of raw water for boiler feed water in palm oil mills comes from lake, river, or well. Relatively not much condensate can be recovered in palm oil mills due to the high amount of unrecoverable sterilizer condensate and the application of live steam in some of the process heating. In palm oil mills, low cycle of concentration is not uncommon which indicates more chemicals are wasted through blow-downs.
In general, wood fired boiler water treatment consists of external and internal water treatment. External water treatment refers to conditioning boiler feed-water by removing impurities, hardness, oil, oxygen, dissolved and suspended solids, outside the boiler and usually accomplished by mechanical means such as continuous clarifier, pressure sand filter, water softener, and deaerator. Because it is not possible to obtain a perfect boiler feed water by external water treatment, an internal water treatment, which mainly by chemical means, shall be employed. All boiler engineers must be aware that the external treatment of boiler feedwater must be emphasized since more chemical addition in the boiler is undesirable.
External Treatment for Boiler
In industrial boilers, the removal of turbidity and suspended matters is already done by the municipal water treatment system. This is however a different story in palm oil mills. The external treatment for boiler makeup (feedwater) consists of pH adjustment, coagulation, flocculation, sedimentation, filtration, water softening, and finally, deaeration. Soda ash is added if the pH of the water is low. Soda ash acts as pH adjustment because coagulant functions at pH ranges over 5.5 to 8.0. The coagulation chemicals are dosed into the inlet pipe leading to the bottom of a continuous water clarifier. Coagulation and flocculation are the basic steps in boiler water treatment to reduce turbidity, organic substances, and color of raw water.
Internal Treatment for Boiler
The internal treatment involves the addition of reactant chemicals such as sulfite, sodium phosphate, chelates, polymers, and caustic, which each has different function in treating boiler water. To prevent oxygen corrosion, the chemical known as oxygen scavenger is added. The common oxygen scavengers are sulfite, hydrazine, and DEHA. Hydrazine however should be avoided because it is carcinogenic.. Phosphate prevents scaling by precipitating calcium as calcium triphosphate or hydroxylaptite, which can be removed via blow-down.
Source: http://www.zgsteamboiler.com/solution/boiler-water-treatment-in-palm-oil-m.html
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Packaging Detail:Wooden box package of Boiler Water Treatment in Palm Oil Mills
Delivery Detail:20-40 days after payment
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Established:In 1945
Number of Employees:above 1500 People
Our products:industrial horizontal steam boiler and hot water boiler(biomass boiler, gas boiler, oil boiler, coal boiler, etc), CFB boiler, power plant boiler, waste heating recovery boiler, Pressure Vessel(AAC autoclave, Curing tank,etc )
Factory Size (Sq.meters):400,000 square meters
Factory Location:Factory 1: Zhengzhou,,Henan, China. Factory 2: Xingyang,Henan,China
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Source: http://www.zgsteamboiler.com/solution/boiler-water-treatment-in-palm-oil-m.html
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