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Pillow plate heat exchanger applications in condensing paper pulp black liquor

1 set
Pillow plate heat exchanger applications in condensing paper pulp black liquor
Features Gallery Product Description Request A Quote
Material: AISI304/316/Ti
Core Components: Laser Welded Pillow Plate Exchanger
Application Industries: Food & Beverage Factory, Chemical Factory
Power Source: Steam
Frame Materia: CS/SS
OEM: Available
After Warranty Service: Overseas Service Center Available,facility Installment And Commission
Advantage: Low Run Expense
Liquid Flow Rate: Depends On The Model
Warranty: 12 Months
Basic Infomation
Place of Origin: Jiangsu,China
Brand Name: HANPU
Certification: CE,ISO9001
Model Number: HP-MVR
Payment & Shipping Terms
Packaging Details: Bulk with includes fixtures and fittings
Delivery Time: 90 days
Payment Terms: L/C, D/A, D/P, T/T, Western Union
Supply Ability: 1 Set/month
Product Description

Critical equipment for the chemical pulp mill

Black 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 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


Name Pillow plate series Shell and tube heat exchanger Detachable plate heat exchanger Spiral plate heat exchanger
Operating temperature range <800℃ <800℃ <170℃ <350℃
Maximum pressure <60 bar <200 bar <32 bar <25 bar
Heat transfer coefficient to water[W/m2·℃] 3500 2700 5600 2000
Application of air and water heat exchange fit fit not fit Partial fit
Immersion in tank or water fit Partial fit not fit not fit
Welding of tank and reactor Applicable not applicable not applicable not applicable
Install into the existing reactor and other equipment Flexible application Partial applicable not applicable not applicable
All welded construction Applicable Applicable not applicable not applicable
Heavily contaminated liquids and other applications Applicable Applicable Partial Applicable Applicable
Weight per unit area low high low high
Falling film, condenser and evaporator fit fit Partial fit Partial fit


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.

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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.
Steam generation in the Kraft mill is a significant operating expense and every effort must be made to conserve its use. The evaporation plant is by far the major consumer of that steam for the removal of water from the weak black liquor.Economic operation of the evaporator is therefore predicated upon the multiple effective use of the heat available from the steam and therefore on the number ofeffects in the MEE.

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Application of technology in black liquor evaporation of pulp
Taking the evaporation of wheat straw pulp black liquor as an example, the combination evaporation process of MVR technology and multi effect evaporation has perfect effect.


Production Workshop

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