Chemical Engineering - Heat Transfer - Discussion

Multiple effect evaporator with backward feed system.

What is Black Liquor?

Black liquor is a by-product generated during the paper manufacturing process. In the paper making process, wood chips are dissolved in an aqueous solution or white liquor. This causes the chemical lignin, which binds the cellulose fiber in wood, and other organic matter to dissolve, forming the black liquor. The remaining cellulose pulp is harvested to make paper.

When released into the environment without being treated, this liquid waste can be extremely hazardous. To prevent environmental hazards, paper mills attempt a recovery process to recycle the waste.

If the solution is very viscous means then we have to adopt a multiple effect evaporator with backward feed.

MEE where the black liquor is concentrated from 10 - 16% solids to 60 - 66% solids.

Hi, can anyone I want to make a Drier tray Compartment utilizing shallow geothermal energy. I immerse in 65 °C of hot springs water a Galvanized pipe 1/2 inch, thickness 1.8 mm, length 18 m, I blow an air 21 °C through the pipe 3m /s. How many centigrade I expecting the air sprout? Thanks.

In single effect evaporator, the economy is 1.5kg of water per kg steam whereas in MEE is greater.