Pillow plate heat exchanger applications in condensing paper pulp black liquor
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Critical equipment for the chemical pulp millBlack liquor evaporation is an essential part of the chemical recovery process as it significantly concentrates the dry solid matter in black liquor so that the liquor can be effectively combusted in recovery boiler. The water removed from the liquor can be segregated and processed so that it can be reused in the mill – reducing fresh water requirements, effluents, and saving money.
Evaporators and concentrators, with their lamella heating surfaces, are adept at processing the spent cooking liquors or mill effluents using the minimum amount of energy while maximizing product dry solids, plant availability, and condensate quality. The lamella heating surfaces are inherently non-scaling. This allows the use of various heat sources inside the lamella, allowing the mill to select the most energy-efficient process connection.
Evaporation Mission: Evaporation of weak black liquor to separate water and create a combustible product-strong black liquor
The three main processes that occur in the evaporator are: Black liquor+heat to Strong Black liquor + Water + Steam Condensate + Steam to Clean + Dirty condensate + NCG Black liquor to Black liquor + Soap (only softwood)
Basic process requirements Efficient use of energy Efficient separation of water vapor from black liquor Proper separation of methanol, tall oil soap Concentration of black liquor to 75-85% dry solids
MVR Technology MVR technology is to compress the secondary steam of the evaporator by mechanical method, increase its pressure and temperature, increase its enthalpy, and then send it back to the heating chamber of the evaporator to be used as heating steam, so as to keep the feed liquid in boiling state, while the heating steam itself condenses into water. Compared with the multi effect evaporation technology, MVR technology compresses and recycles all the secondary steam and recovers the latent heat, so it is more energy-saving than the multi effect evaporation technology.
Multiple effect evaporators Multiple effect evaporators are always used in black liquor
service. The term muliple effectcomes from the multiple effective
use of energy to perform the evaporation task. In such
configuration,live steam is condensed only in the first effect
evaporator, generating vapors that are then sent to condense in a
second effect where additional evaporation takes place. The process
can then be repeated until reaching the last effect evaporator
where generated vapors are condensed in a condenser using cooling
water.
Application of technology in black liquor evaporation of pulp
Production Workshop
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