Table of Contents
What is the evaporator process?
An evaporator is a device used in a process to turn the liquid form of a chemical substance, such as water, into its gaseous form – vapor. The liquid is evaporated, or vaporized, into a gas form of the targeted substance in that process.
Which factors should be considered in designing of the evaporator?
Many factors must be carefully considered when designing evaporators. The type of evaporator or heat exchangers, forced or natural circulation, feeding arrangement, boiling point elevation, heat transfer coefficient, fouling, tube size and arrangement are all very important.
What is evaporation in chemical engineering?
INTRODUCTION. Evaporation is the removal of solvent as vapor from a solution, slurry or suspension of solid in a liquid. The aim is to concentrate a non-volatile solute, such as organic compounds, inorganic salts, acids or bases from a solvent.
What equipments are used in evaporation?
The main piece of equipment used at the heart of the evaporation process is the evaporative heat exchanger….Types of Evaporators
- Falling Film Evaporator.
- Rising Falling Film Evaporator.
- Flash Evaporator.
- Forced Circulation Evaporator.
What are the four 4 classifications of evaporator?
Types of Evaporators: Bare Tube, Plate Evaporators, Finned Evaporators.
What is the function of the evaporator?
The main job of the evaporator coil is to cool the refrigerant so that it can absorb the heat. As the fan blows air over the coil, the refrigerant becomes cold and turns into a vaporous state.
How do you calculate the heat transfer of an evaporator?
- Heat balance. Heat available per kg of steam. = latent heat + sensible heat in cooling to 91°C. = 2.164 x 106 + 4.186 x 103(134 – 91)
- Heat-transfer area. Temperature of condensing steam = 134°C. Temperature difference across the evaporator = (134 – 91) = 43°C.
- Heat balance.
What is the capacity of an evaporator?
• Capacity of evaporator is defined as the number of kilograms of water vaporized/evaporator per hour. The rate of heat transfer Q the heating surface of evaporator is the product of heat transfer heat transfer surface area and the overall temperature drop.
What is the formula for the capacity of evaporator?
Explanation: Economy of an evaporator is defined as, E = Capacity/Consumption = (30/45) x 100 = 66.7 = 67\%. 4. What is the Evaporator Consumption if we evaporate 10kg of water from a feed of 50kg at a temperature of 25℃ to a final temperature of 100℃ in an hour? Hence the Evaporator Consumption = 20kg/hr.
What is evaporator capacity?
Which evaporator is used for evaporation of viscous liquid?
forced-circulation evaporators
Natural-circulation tubular evaporators Natural circulation is normally used for simple applications where the product is clean and temperature-stable (whereas forced-circulation evaporators are used for viscous, salting and scale-forming products) (2).
What are the types of evaporator?
Evaporators may be classified into falling film evaporators (in which evaporation takes place from the film interface with no nucleate boiling at the wall), nucleate boiling evaporators (in which wall nucleate boiling occurs over part or all of the heat transfer surface), flash evaporators and direct contact …