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Chimneys

 
Chimney on the truss
Mast chimney
Column chimney

Chimneys are a necessary element in the design of boiler plants in accordance with SP 89.13330.2016 "Boiler plants. Revised edition of SNiP II-35-76". Their main purpose is the waste gases removal to the atmosphere, as well as ash, soot, condensate and other waste products that are formed as the result of heat generation. At the same time, leaving the chimney, hazardous exhaust gases lose dangerous concentration and are practically environmentally safe.

According to construction rules and regulations, any boiler house is equipped with at least one chimney. Two or more chimneys are possible with the technical justification of such a need.

The main requirement for chimneys is to provide natural or forced draft: exhaust substances should get through the gas pass.

Manufacture and construction of chimneys

Depending on Customer requirements, the Factory GazSintez produces chimneys (supporting shaft and flues) of different materials: stainless or carbon steel grades with a thickness of 3-10 mm. The chosen steel grade and thickness of the steel shape should ensure the chimney frame stiffness.

Heat insulation of chimneys

The availability and type of the chimney heat insulation is determined at the design stage. It can be made of mineral wool mats or basalt wired mats.

In addition, at the Customer's request the chimney can be sheathed with galvanized steel sheets.

Anti-corrosion treatment of chimneys

The durability of the chimney depends on the quality of the anti-corrosion treatment, which will prevent corrosion of the pipe outer surface affected by environmental conditions. As an anti-corrosion treatment, we offer a coating of refractory enamel or bitumen paint.

Types of chimneys

Factory GazSintez manufactures several structural designs of the chimneys:

  • chimneys with guylines
  • chimneys on the truss
  • mast chimneys
  • column chimneys
  • front chimneys

Chimneys with guylines

This type is the simplest structure in terms of manufacture process, delivery and installation.

The chimney with guylines is a steel pipe which is fixed by guylines arranged in booms which quantity depends on height and thickness of a pipe.

The base of such chimneys is placed in an anchor block, casted in cement on the construction site.

The diameter of such chimneys varies from 300 mm to 1200 mm, and the height - from 12 m to 45 m.

The advantage of chimneys with guylines is the possibility of their operation in areas with high seismic activity.

Chimneys on the truss

Structurally these are the same chimneys with guylines, but they differ in type of fastening. The chimneys on the truss are attached to a metal farm on three or four sides. It is also possible to install several gas exhaust shafts inside the truss structure. The advantage of this type of the chimney is the ability to attach several pipes to a single truss.

The diameter of the pipe on the farm-300-400 mm, height-8-30 m.

The advantage of chimneys on the truss is the possibility of their installation in areas with high seismic activity and on bog soil.

Mast chimneys

Mast chimneys are a type of chimneys on the truss: the flue is attached to a vertical mast. Up to 3 gas exhaust trunks may be mounted on the self-supporting mast. The flue and mast are installed into the mounting base, and then into the foundation. The height of mast chimneys can reach up to 28.5 m.

Column chimneys

Column chimneys are attached to the outer pipe, column, that is, the flues (2-5 pcs.) are placed inside the steel structure - the column. The advantage of this type of chimney is that the flues can expel exhaust gases from several boilers in parallel.

The height of the column chimneys may be up to 60 m. The diameter of the outer column is up to 3450 mm, and the diameter of each gas exhaust duct - up to 1500 mm.

Front chimneys

Front chimneys are highly resistant structures, as they are attached to the facade of a building with bolt anchorage and special clips with vibration insulating insertions. Traditionally, the front chimneys are made heat insulated: the chimney is covered with wool heat insulating products and then is sheathed with steel sheets.

A feature of the front chimneys is the ability to clean the bottom of the chimney from dirt and condensate.

In order to choose the most suitable structural design, the number of flues, their height and diameter, the specialists of the Factory design and produce chimneys on the basis of the following parameters:

  • boiler room power (number of boilers), fuel type
  • operating conditions
  • soil constitution
  • requirements for chimney aerodynamics (wind load)
  • gas velocity
  • characteristics of the upward pull