Chimney is the main way to discharge coal-fired waste gas in
thermal power and metallurgy industries. The thermal power
industry, for example, in the past, dust-remove measures only be
taken for coal-fired waste gases, which were released into the
atmosphere through tall chimneys. Nowadays, due to the requirements
of environmental protection, sulfur dioxide emissions shall be
strictly controlled, the waste gas needs to be desulfurized.
At present, the thermal power industry mostly adopts wet
desulfurization. Before the adoption of wet desulfurization
process, although the flue gas contains a lot of sulfur dioxide,
the temperature of flue gas entering the chimney is relatively
high, up to 130~160℃, and only a small amount of flue gas
condensation phenomenon is formed, so the corrosion prevention
requirements for the chimney are not very strict.
However, after the wet desulfurization, the flue gas temperature
drops to 50~80℃, and the moisture content of flue gas is relatively
high, which leads to the increase of corrosion concentration on the
inner wall of the chimney. Although the flue gas temperature after
wet desulphurization drops to 50-80℃, flue gas temperature without
wet desulphurization in emergency state (about 150℃) and
temperature in accident state (nearly 200℃) shall be taken into
account when designing, so wet desulphurization chimney has higher
requirements on corrosion resistance and temperature resistance.
In order to solve the problem of serious corrosion on the inner
wall of the chimney caused by the installation of wet
desulphurization device, technicians at home and abroad have done a
lot of research and engineering tests. At present, the commonly
used anti-corrosion materials of chimney include acid-resistant
brick - acid-resistant cement paste, steel-titanium composite
structure, steel-stainless steel composite junction, steel-coating
material and hard E-276 alloy lining.
The new type of fiberglass chimney has the advantages of corrosion
resistance, low investment, short construction period, light weight
and long service life.
Application of FRP Chimney
After reasonable design, manufacture and installation, FRP has been
used in the structure and whole set of equipment of wet
desulfurization system, which has obvious technical economic and
social benefits, it has long service life and reliable operation.
It has been widely used in foreign countries. Technical and
economic analysis is feasible.
Replacing the traditional alloy steel, and carbon steel lined with
rubber, carbon steel coating resin scale and other materials with
FRP to fabricate fume gas desulfurizing device, which is with good
corrosion resistance, long service life, high strength, energy
Comparison between FRP chimney and chimney made with other material
Excellent corrosive resistance property.
High performance -price ratio, low lift cost
No need of maintenance for a long period, high temperature
The product has strong designability and can be customized
according to different needs of customers
2、Titanium (nickel) alloy composite steel liner
Good corrosive resistance property; corrosion will occur easily in
the welding seam area; price is expensive.
(1) Foam glass brick, it has strong corrosion resistance property.
The construction process is complex and the construction period is
(2) Sprayed concrete: Poor construction conditions and construction
process is complex.
(3) High performance, heat and acid resistant coating: short
service life, complex maintenance
(4) Masonry glazed acid resistant brick chimney The manufacturing
period is relatively long.
Concrete lined FRP chimney
It is mainly used for the inner cylinder of the concrete chimney
with the height of 100m-200m.In this structure, make full use of
property of FRP, such as high temperature resistance, corrosion
resistance characteristics, concrete chimney to provide the
support. Some concrete chimney is fitted with 1 glass fiber
reinforced plastic pipe liner, some have 2 or 3 glass fiber
reinforced plastic pipe liner, which is according to the design and
In general, the structure form of segmental hanging wall will be
adopted for the inner cylinder of concrete jacket. A steel
structure embedded in the concrete chimney as a support system.
Generally 30-50 meters is a section, each section is connected by
an expansion joint, and a guide support is designed every 15
1st step: convey the 1st section of inner cylinder to the bottom
end of chimney with flat car
2nd step: connect the 1st section of FRP cylinder with hoisting
rope then lift the pipe section to the height of connection
3rd step: convey the 2nd FRP cylinde