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Falling Film Gearbox Pillow Plate Heat Exchanger For Heat Recovery Evaporator

Falling Film Gearbox Pillow Plate Heat Exchanger For Heat Recovery Evaporator

Brand Name:HANPU
Model Number:HP-MVR
Minimum Order Quantity:100m2
Delivery Time:30 days after down payment
Payment Terms:T/T, L/C, D/A, D/P, Western Union
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Address: Junmin Road, Huangqiao Industrial Park, Taixing, Jiangsu, China (Mainland)
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Falling Film Pillow Plate Heat Exchanger for Heat Recovery Falling Film Evaporator

multiple-effect evaporator and concentrator

Evaporation plants are well-proven in installations around the world. There are a variety of configurations and models available – from pre-evaporators to multiple-effect evaporation trains – to accommodate even the most challenging pulp mill or effluent plant evaporation needs

The major advantage to multiple-effect evaporators is the utilization of proven lamella heating surfaces for high efficiency and reliability.


Evaporation plant lamellar

lamella heating surface

NamePillow plate seriesShell and tube heat exchangerDetachable plate heat exchangerSpiral 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·℃]3500270056002000
Application of air and water heat exchangefitfitnot fitPartial fit
Immersion in tank or waterfitPartial fitnot fitnot fit
Welding of tank and reactorApplicablenot applicablenot applicablenot applicable
Install into the existing reactor and other equipmentFlexible applicationPartial applicablenot applicablenot applicable
All welded constructionApplicableApplicablenot applicablenot applicable
Heavily contaminated liquids and other applicationsApplicableApplicablePartial ApplicableApplicable
Weight per unit arealowhighlowhigh
Falling film, condenser and evaporatorfitfitPartial fitPartial fit


Black Liquor is a by-product of pulp from mills that make products from trees, such as paper. It is currently used to recover cooking chemicals and produce high-pressure steam used in the pulp and paper-making process. It is composed of different ingredients from these processes such as lignin, hemicellulose, sodium hydroxide (NaOH) and sodium sulfide (Na2S). The lignin compound in black liquor can be used to make biofuel but it can be expensive to produce and so fuel made from it is not very common.

However, and according to the International Energy Agency (IEA), the future of using black liquor as fuel is promising and it is seen as the fifth most important fuel on earth!

Black liquor evaporation

Black liquor recovered from pulping contains 14-17% dissolved solids

These solids are composed of about 1/3 inorganic chemicals that were in the white liquor added to the digester

The remaining 2/3 consist of the organic chemicals extracted from the wood

Black liquor must be concentrated to above 60% solids so that it will burn without supplemental fuel

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



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)

How to reach 80-85% dry solids?

Due to the high viscosity

MP-steam as heating medium

liquor temperature 175 ℃ in final concentrator

Liquor retention time

evaporator acts also as a LHT-reactor

Duplex construction material

high alkali content may cause Stress Corrosion Cracking (SCC)


Energy-efficiency for reduced costs

Highest dry solids liquors with maximum availability using crystallization technology

Cleanest reusable condensates using the minimum amount of steam

Lowest steam and electricity consumption


Tolerate even non-soluble scaling

China Falling Film Gearbox Pillow Plate Heat Exchanger For Heat Recovery Evaporator supplier

Falling Film Gearbox Pillow Plate Heat Exchanger For Heat Recovery Evaporator

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