Select Page

Minimising energy consumption in edible oil refining

Background

 

A world-leading company in the refining of vegetable oils (palm oil, soyabean oil, rapeseed oil, sunflower oil, among others) has contacted SACOME to design and manufacture a process plant for the thermal treating of 45.000 kg/h of different types of edible oils within the refining process for one of its factories.

One of the main concerns of our client was to reduce as much as possible the energy consumption. With this in mind, our Technical Staff got involved to the maximum in the design of the tubular heat exchangers, paying special attention to the heat recovery section. We proposed our client different alternatives, advising him to get a minimum payback time to recover the initial investment.

Furthermore, our Technical Department proposed a customized design which included a special cladded insulation with the aim to minimise the heat losses to the environment, thus contributing to reduce the energy consumption.

In addition to dealing with the heat recovery, in the next sections we will go into the details of the design of heat exchangers for the processing of vegetable oils.

The solution

 

As stated earlier, it is not necessary to emphasize the critical importance of the energy consumption in the costs when refining oil. Using energy in the most economical way was the biggest concern for our client, hence energy recovery and reduction in the consumptions became in our main objective in the design of the tubular heat exchanger.

In this regard, our Technical Department checked different alternatives and advised our client to get a payback time as short as possible.

Moreover our engineers checked the different phases of operation, as start-up and shutdown, from the thermal and mechanical point of view.

All the above, together with the fact of the restrictive working conditions due to the high temperatures and pressures, made using the tubular heat exchangers with corrugated tubes to be the most suitable from the mechanical and thermal point of view.

Process

 

Edible oils can be obtained from a wide variety of seeds, grains and nuts, being essential its refining to allow they can be used for cooking purposes.

The fact is that vegetable oils and fats contain some impurities, being some examples moisture, lecithins, insoluble solids, free fatty acids, waxes and metals as sodium, potassium, magnesium or calcium.

Colour, odour and taste are also features that must be taken into consideration to get an optimal quality for the oil.

The refining process comprises several steps such as bleaching (removal of pigments) and deodorising (removal of odor and taste), but also other stages as degumming (removing of hydratable and non-hydratable gums, i.e. lecithin), neutralising (to remove free fatty acids), and dewaxing (removal of waxes).

In all these phases, important changes of temperature (from ambient temperature up to 300 ºC) are involved.

 

Due to the important temperatures reached along the process (close to 300 ºC) one of the key feature in this project was to recover as much energy as possible, minimising the heat consumption.

Vegetable oils refining process chart

Product Specifications

 

The heat exchanger of this project had to process different types of vegetable oil during its production cycle. Vegetable oil is an organic compound formed of triglycerides extracted from a plant.

In this regard, SACOME has hundreds of references in the processing not only of numerous types of edible oil, but also of animal fats and their derivatives, such as:

Palm oil
Soybean oil
Rapeseed/canola oil
Olive oil
Sunflower seed oil
Linseed oil
Coconut oil
Fatty acids
Lecithin
Animal fats
Biodiesel
Fish-by-products in oil phase

 

This huge number of references has brought us an extensive knowledge of the process and of the different products that can be processed.

Apart from the difficulties for the thermal calculation with fluids having such low conductivity and medium viscosity, several details had to be taken into consideration by our engineers during the design stage.

As an example, some types of vegetable oils can become polymerized after the high temperatures reached during deodorisation, resulting in high fouling and even plugging of the flow paths.

It was also significant to choose properly the order in which the different oils were processed, as some kinds (to be processed the last ones) can do a self-cleaning effect in the product side.

 

SACOME can provided you with an extensive knowledge about the process of vegetable oils, animal fats and their derivates 

Tubular Heat Exchanger Design

For this project we have supplied our I-TFM-I tubular heat exchanger, whose main features are as follows:

Multitubular geometry
Multitubular heat exchanger geometry consists of a tube bundle; the crude oil flows in the tubeside and the refined oil is processed in the shellside.

Intercambiador tubular industrial multitubular SACOME

Corrugated inner tubes
The inner tubes were HARD corrugated in order to increase the turbulence of the product, thus reducing the risk of fouling and increasing the thermal efficiency.

Intercambiadores de Calor de tubo corrugado SACOME

Flanged or welded tubesheet
Depending on the role of the heat exchanger, a design with flanged or welded tubesheets must be selected. The flanged tubesheet allows an easy removal of the reductions for inspection and cleaning tasks of the inner tubes.
Gaskets
Unlike other geometries (as plate heat exchangers), the maintenance costs in our tubular heat exchangers are minimum, being the gaskets just in interconnections between modules.
Self-drainability in tubeside
Since this process plant was intended for processing different types of edible oils, it was a requirement that the remaining product could be easily recovered after production stop.
Removable tube bundle
For vegetable oil processing, we design and manufacture our I-TFM-D heat exchanger in which the tube bundle can be easily removed to enable an easy access to the shellside, being an ideal geometry with edible oil in both channels.
Cladded and insulated frame
Because of the high temperatures in the refining treatments reached (close to 300 ºC) it was needed a cladded & insulated frame.

 

Bastidor cerrado y aislado para aceite vegetal

Key Figures

Process Flowrate (Kg/h)

Design Temperature (°C)

Design Pressure (bar)

Heat Recovery (kcal/h)

Floor Space (mm)

Do you need minimising energy consumption in edible oil refining?

Our Technical Staff shall be delighted to provide you with detailed information

Contact Us!

Este sitio web utiliza cookies para que usted tenga la mejor experiencia de usuario. Si continúa navegando está dando su consentimiento para la aceptación de las mencionadas cookies y la aceptación de nuestra política de cookies, pinche el enlace para mayor información.plugin cookies

ACEPTAR
Aviso de cookies