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DOUBLE-EFFECT RISING FILM EVAPORATOR MP1052

Specifics of the installation

  • Industrial instrumentation

  • Cooling water flow rate alarm for the safety of the operators

  • Safety valve for the heating vapour

  • Lagging and panels on the heating vapour to protect operators

  • 316 L stainless steel and borosilicate glass structure

  • Stiff pipe work process

 

PRINCIPLE OF OPERATION :

The aim of the evaporation is to achieve a concentrated solution composed of a volatile solvent and a less volatile solution.

Rising film evaporation is a continuous process whereby the solution is heated in a single-tube vertical evaporator to vaporise the solvent. (First effect).

In the cyclone at the head, the mist, formed by the solution being vaporised and made up of the solvent's vapour and the concentrated solution, is separated into two phases: the concentrated liquid phase is released by the effect of gravity and then sent by a metering pump to the second evaporator whereas the vapour phase is used to heat the second evaporator.

In the second rising film evaporator, the already concentrated solution is heated, under a reduced pressure, to vaporise the solvent (second effect).

In the secondary cyclone, the mist, formed by the solution being vaporised and made up of the solvent's vapour and the concentrated solution, is separated into two phases: the concentrated liquid phase is released by the effect of gravity and then stored, whilst the vapour is condensed before being collected in a receptacle.

 

Teaching objectives

 

Studies of the following experimental parameters :

  • Continuous concentration of a solution by evaporation.

  • Impact of operating conditions.

Calculations :

  • Thermal balance

  • Material balance

 

Technical specifications


EQUIPMENT :

  • Polyethylene storage container of the inlet solution.

  • 316 L stainless steel PTFE first-effect manual supply metering pump.

  • Rising film evaporator (first effect), borosilicate glass barrel and 316 L stainless steel tube for heated vapour; detachable and thermally insulated.

  • Borosilicate glass cylinder-conical cyclone for separating the fluid from the vapour.

  • 316 L stainless steel PTFE second-effect manual supply metering pump with low-level emergency stop.

  • Rising film evaporator (second effect), borosilicate glass barrel and 316 L stainless steel tube for heated vapour; detachable and thermally insulated.

  • Borosilicate glass cylinder-conical cyclone for separating the fluid from the vapour.

  • Vertical condenser, borosilicate glass barrel, 316 L stainless steel heating coil exchanger.

  • 316 L stainless steel solvent condenser.

  • Borosilicate glass solvent receptacle, with markings.

  • 316 L stainless steel concentrate condenser.

  • Borosilicate glass concentrate receptacle, with markings.

  • Borosilicate glass vacuum trap.

  • Circuit for releasing and regulating the first-effect heated vapour, with panel to protect operators.

  • 316 L stainless steel connecting pipe work for the process and reinforced PVC for the cooling fluid.

  • 304 L stainless steel tubing support structure and aluminium nut.

     

INSTRUMENTATION :

  • Condenser has a supply of cooling water, and is fitted with a float flowmeter, control valve and a water flow switch to shut down the heating by cutting off the cooling system.

  • Measurements of the supply pressure of the first-effect heating vapour using BOURDON pressure gauge tubes.

  • Measurements of the supply pressure of the second-effect heating vapour using BOURDON pressure gauge tubes.

  • Measurements of the pressure of the process using BOURDON pressure gauge tubes.

  • IP55 control and inspection cabinet, featuring an emergency stop, start-up buttons and the following interfaces:

  • Two numeric temperature indicators for twelve Pt100 Ω probes.

 

Dimensions and weight

2.5 m x 0.6 m x 3.8 m ~ 200 kg.

 

Essential requirements

230 V / 50 Hz / Single-phase: 1 kW.

10°C / 3 bar Cold water: 600 l/h.

Vapour at 4 bar: 4 kg/h.

Vacuum 10 mbar: 20 Nm³/h

Drain for heating condensates.