KETTLE TYPE REBOILER PDF

So at the surface of the tubes the process fluid is getting vaporized and vapor is being formed. But the vapor blanketing and bubbling issue seems to be tied onl to thermo, which is what I was wondering why The nucleate, transition, film boiling transitions happen to both vaporizer types. So, your kettle can also experience vapor blanketing film boiling at some heat flux and temp. However, the transitions are not related to vaporization ratio of the kettle because of its non-flowing, pool boiling characteristic. You can easily pick a "safe" operating point for your kettle and operate at desired boiling regime. Therefore, it is easier to design a kettle than a thermosyphon.

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Most reboilers are of the shell and tube heat exchanger type and normally steam is used as the heat source in such reboilers. However, other heat transfer fluids like hot oil or Dowtherm TM may be used. Fuel-fired furnaces may also be used as reboilers in some cases. Commonly used heat exchanger type reboilers are: Image 1: Typical steam-heated kettle reboiler for distillation towers Kettle Type reboilers[ edit ] Kettle reboilers Image 1 are very simple and reliable.

They may require pumping of the column bottoms liquid into the kettle, or there may be sufficient liquid head to deliver the liquid into the reboiler. In this reboiler type, steam flows through the tube bundle and exits as condensate.

The liquid from the bottom of the tower, commonly called the bottoms, flows through the shell side. There is a retaining wall or overflow weir separating the tube bundle from the reboiler section where the residual reboiled liquid called the bottoms product is withdrawn, so that the tube bundle is kept covered with liquid and reduce the amount of low-boiling compounds in the bottoms product.

Image 2: Typical horizontal thermosyphon reboiler Thermosyphon reboilers[ edit ] Thermosyphon reboilers Image 2 do not require pumping of the column bottoms liquid into the reboiler. Natural circulation is obtained by using the density difference between the reboiler inlet column bottoms liquid and the reboiler outlet liquid-vapor mixture to provide sufficient liquid head to deliver the tower bottoms into the reboiler.

Thermosyphon reboilers also known as calandrias are more complex than kettle reboilers and require more attention from the plant operators. There are many types of thermosyphon reboilers including vertical, horizontal, once-through or recirculating. Image 3: A forced recirculating fired heater reboiler Fired reboiler[ edit ] Fired heaters Image 3 , also known as furnaces, may be used as a distillation column reboiler.

The heat source for the fired heater reboiler may be either fuel gas or fuel oil. Image 4: Typical steam-heated forced circulation reboiler for distillation towers Forced circulation reboilers[ edit ] A forced circulation reboiler Image 4 uses a pump to circulate the column bottoms liquid through the reboilers.

This is useful if the reboiler must be located far from the column, or if the bottoms product is extremely viscous. Some fluids are temperature sensitive such as those subject to polymerization by contact with high temperature heat transfer tube walls. High liquid recirculation rates are used to reduce tube wall temperatures, thereby reducing polymerization on the tube and associated fouling.

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Thermosyphon Vs Kettle Reboiler

Most reboilers are of the shell and tube heat exchanger type and normally steam is used as the heat source in such reboilers. However, other heat transfer fluids like hot oil or Dowtherm TM may be used. Fuel-fired furnaces may also be used as reboilers in some cases. Commonly used heat exchanger type reboilers are: Image 1: Typical steam-heated kettle reboiler for distillation towers Kettle Type reboilers[ edit ] Kettle reboilers Image 1 are very simple and reliable. They may require pumping of the column bottoms liquid into the kettle, or there may be sufficient liquid head to deliver the liquid into the reboiler. In this reboiler type, steam flows through the tube bundle and exits as condensate. The liquid from the bottom of the tower, commonly called the bottoms, flows through the shell side.

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