Technical Papers
Design of a Chimney with GRP Liner for Low and High Temperature Operation
Victor A. Bochicchio
Abstract
This paper describes the design of a chimney with a GRP liner with several design features to accommodate both low and high temperature operation following an FGD system with continuous bypass capability, including a highly ventilated annulus, and a special high temperature resin for use in the GRP laminate. The chimney also incorporates a large construction opening to accommodate erection of the GRP liner sections with structural components to provide performance equivalent to a similar chimney with a normal sized opening.
Click here to download the entire paper (pdf, 1,520 KB)
Keep Chimneys In Step with Plant Changes
Arun K Bhowmik
Abstract
Operational variations have an impact on the stack, often increasing corrosion and deterioration.
Chimneys and stacks appear to be relatively stable components in an industrial plant. However, they are not immune to the
impacts of changing plant operations.
During their lifespans, chimneys may be exposed to a variety of changes, including variations in plant production,
energy requirements, and environmental regulations. For instance, in some cases, new environmental regulations may require
an extension in chimney height, a modification that alters the stress conditions of an existing structure.
Click here to download the entire paper (pdf, 391 KB)
Maintenance Spells Extended Life for Chimneys and Stacks
Arun K Bhowmik
Abstract
Chimneys are often overlooked when plant maintenance and repair programs are developed. Chimneys are basically passive
structures with few mechanical parts that require maintenance attention to keep them functional. Because of this, it is easy
to overlook them - but doing so can be costly.
Chimneys and stacks have only one function: dispersing flue gas into the atmosphere. In the process of fulfilling
that function, they are exposed to harsh environments, both inside and outside. Flue gas, with its abrasive and corrosive
characteristics, can damage the structural materials of the chimney or liner. Climatic conditions, ranging from high winds
to extreme cold, place extreme stress on the structure itself.
Click here to download the entire paper (pdf, 446 KB)
Pressurize chimney annulus to avoid acid attack
Arun K Bhowmik
Abstract
Chimney annulus pressurization is not uncommon in the power industry. Many new chimneys have pressurization fans already
existing and operating; however, many older chimneys built with brick linings do not have an annulus pressurization system.
After years of service, these brick liners show signs of normal cracking, and flue gases under positive pressure tend to permeate
through the brickwork into the annulus. This causes deterioration of mortar joints and corrosion of lining bands and other
metal components within the annulus. It also can cause spalling of concrete on the inside face of the chimney column.
Click here to download the entire paper (pdf, 168 KB)
Stabilization of a Nearly Collapsed Brick Liner in a Concrete Chimney, and Subsequent Reuse of the Liner
Arun K Bhowmik
Click here to download the entire paper (pdf, 1.87 MB)
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