Unistara designs and installs refractory linings for petrochemical plants, refineries, the chemical industry, ethylene furnaces and FCC reactors, ammonia plants and reformers. Normally these are large plants, often characterized by aggressive atmospheres and condensation and/or other particular stresses.
The identification of the correct lining for a petrochemical plant must take into account some basic factors such as operating temperature, possible temperature variations, heat loss, the maximum required temperature on the external structure, furnace atmosphere, erosion, abrasion and other stresses. The combination of these characteristics leads to a lining based on:
Characterized on average by low permeability and spalling resistance, they reduce expansion joints and have a competitive cost compared to brick linings.
Low iron content, in all grades and classes from 23 to 32, according to international ASTM classification, particularly suitable for high temperatures and reducing atmospheres (but with limited resistance to mechanical action and acid condensation).
Indicated in the case of abrasive actions and where there is a need to absorb considerable hot compressive stress.
Unifrax brand mats and papers, in low bio persistence fiber. Insulfrax and Isofrax products, with classification temperatures of up to 1200°C and 1400°C, thanks to their very low thermal capacity allow very fast start-up and shutdown.
Anchors for the installation of concrete or fibre coverings must guarantee adequate mechanical and chemical resistance and a low oxidation index.
Design and manufacture of refractory linings or maintenance of existing linings in refineries, chemical industry, petrochemical plants, fractionation, heating, cracking and hydrocracking plants, ethylene furnaces and FCC reactors, ammonia plants and reformers.
These units consist of two radiant chambers that join together to form a convection area. The crude oil passes through these units through pipelines where it is heated before being transported to the distillation column. For radiant chambers, a lightweight concrete lining with various densities or a multi-layer ceramic fibre lining is generally used.
Lightweight concrete of various densities is also used for the lining of reformers. The crude oil passes through these installations through pipelines, which are designed to increase the efficiency of distillation.
Cylindrical or rectangular section furnaces used to increase the temperature in many processes. Their lining consists of several layers of ceramic fibre.
For FCC units, where the long molecular chains are broken in order to produce butane, propane and other high-octane products, medium and high-density concrete and anti-abrasion products are normally used.
The lining of these units, which are designed to reduce the amount of sulphur present in fuels, is made with medium and high-density alumina products.