Turbine Heat Insulation

It is high heat insulation application which is combined the heat insulation material (Isollat, needled glass fiber, ceramic fiber) with hollow thermo-ceramic spheres of the steam turbines and their associated steam inlet and outlet pipes, turbine steam inlet control valves, turbine body heating and valve heating line components in thermal power plants. In turbine insulation applications, the uninsulated body temperature is reduced from 535°С to 45-50°С.
 
ADVANTAGES OF ISOLLAT-EFFECTIVE APPLICATION on STEAM TURBINE INSULATION AND COMPARISON WITH OTHER CLASSIC INSULATION APPLICATIONS (Pillow Type Insulation, Mineral Wool And Others)

NOMINAL INSULATION THERMAL CONDUCTIVITY COEFFICIENT AND COATING APPLICATION THICKNESS
 

Nominal thermal conductivity of Isollat product is 0.002-0.007 W/m °С. This value shows that it conducts heat at least 20-25 times less when comparing the traditional materials in the insulation sector. Isollat ensures high performance insulation of steam turbines, pipes and related equipment with a very thin coating because of the low coefficient of heat conductivity. While the turbine body insulation at +535°С is applied between 6-8 cm with ISOLLAT – EFEKTIF, this thickness should be at least 30-40 cm in classical applications (pillow type insulation, mineral wool and others). When the insulation is too thick emergency response corridors cannot be created for technical personnel because every part of the turbine chamber where the outlet pipes are located is filled with insulation material.
 
CONTINUOUS WORKING LIFE WITHOUT LOSS OF PERFORMANCE OF THE INSULATION COATING

It has 15 years working life at constant performance without loss of performance in applications up to +1200°C with Isollat. Isollat application cannot affected by heat, humidity, UV rays, water and other physical factors, so it maintains its operating performance and efficiency by maintaining its nominal heat conductivity (0.002-0.007 W/m °C) for many years. In the insulation made with classical products (pillow type insulation, mineral wool and others), the materials should be changed after 5-6 years. When the heat conductivity coefficient value increases after the application, a working performance whose efficiency decreases is created instead of a stable working performance.
 
HEAT, SOUND, CORROSION AND FIRE PROTECTION INSULATION AT ONE TIME

Isollat material has HEAT, SOUND, CORROSION and FIRE PROTECTION isolation at one time, which each of them is applied in separate stages with different materials in the processes of a facility. Isollat-EFEKTIF which is applied to the body as a paint layer, provides the combined insulation of the most complex shaped equipment. After drying, it creates both polymer structure and flexible and solid structure with 200% elasticity. It cuts off the contact of the application surface with air, water and moisture and provides advanced corrosion insulation.
 
Equipment which has Isollat insulation can be left under the ground or in open environments where it will be exposed to sunlight (UV light). Pillow type insulation and other classical insulation systems do not have corrosion insulation. Bodies of equipment and pipes are directly exposed to moisture, water and other factors. In applications conducted by using mineral wool and galvanized pipes. After absorbing moisture, mineral wool loses all insulation efficiency values and transmits moisture to the equipment body, after absorbing moisture then it causes to rust and damage over time.
 
THE PREVENTION OF TOP TEMPERATURE OF DESIRED INSULATION AND HEAT BRIDGES

When applying Isollat-Effective maximum efficiency is obtained in high thermal insulations. The surface temperature of the top layer of the insulated equipment and pipes is between +45-55°С and it is reduced to a temperature close to the ambient temperature and this temperature stability remains constant at least 15 years. Since it is a liquid ceramic insulation material, it forms both flexible and integrated polymer structure as a single block after the insulation is applied. Isollat-Efective directly contacts every surface of the insulated equipment and the surface measurements of the top layer have same results after insulation. The formation of thermal bridges, which is a major problem in heating systems and reduces the service life of installations and equipment, is also prevented. Comparing with the classic products, the articulation components create heat leaks because it is made from pillow-shaped parts based on the stretching principle. Over time, loosening occurs in stretching because of the high temperature. Moreover, hanging occurs in the pillow type insulation materials which is formed in the lower bodies of the steam turbine and the heat insulation efficiency is decreased. Therefore, the formation of thermal bridges cannot be prevented as the temperature on the body creates differences. In the measurements conducted in our company, the values ​​measured in the articulation components of the places where new pillow type insulation is applied seem to be +80°С and over. And unfortunately, these measurement values ​​increase over the years.
 
REVISION WORKS AND INSULATION MAINTAINABILITY IN SYSTEMS IN THERMAL PLANTS
 
Some repair works (water leak detection, welding, equipment dismantling and others) in systems where Isollat-Efective is applied on can be done very easily without forcing technical personnel. If there is a water leak, water and other liquid materials cannot progress inside the insulation. The problem area is determined as a point by showing a physical change. The part to be repaired is removed by cutting with a utility knife and scraping with a wire brush. After the repair work is completed, the technical personnel simply perform the insulation repair with a brush using isollat-Effective materials. Although pillow type insulation materials are called "detachable", stretching after removal is difficult and require qualified workmanship. Furthermore, when water leaks occur in pillow type insulation and galvanized mineral wool insulations, water spreads everywhere by moving inside the material, and a large area has to be dismantled and reassembled in order to detect it. When oil leaks occur in pillow type insulations, hot oil reaches the hot body of the equipment and it burns and causes fire or long-term smoke.
 
LESS INSULATION INVESTMENT COSTS
 
Isollat-Effective high heat insulation application has long life (at least 15 years) without losing its nominal heat conductivity value and performance, providing heat-sound-corrosion and fire insulation at the same time. Moreover, it transmits the heat less than 20 times when comparing with other materials (0.002 Technical features such as -0.007 W/m °C).It has thinner layer at least 5-6 times; it is ecological; it is applied direclty to all kinds of complex surfaces; it is very light, it is useful for using indoors, outdoors and under the ground. It is an insulation that has much lower investment cost compared to traditional products.