Internal Furnace Smoke Tube Boilers :Explanation, Types & Products

Internal Furnace Smoke Tube Boilers: Definition

Internal Furnace Smoke Tube Boilers: On the basis of Heat Transfer methods between the flue gases and water, most boilers can be divided into two basic parts: Furnace – where the radiation heat transfer dominates and Tubes – where the convection heat transfer is prominent. Thermodyne’s Intech models are Shell and Tube type, which include furnace and tubes internal to the shell. Majorly, all kind of fuels such as Wood, Coal, Husk, Liquid and Gaseous fuels can be used for combustion in these type of boilers.

Internal Furnace Smoke Tube Boilers

Intech-Three Pass Internal Furnace Packaged Type Boilers

Internal Furnace Smoke Tube Boilers

By Internal Furnace we mean the furnace which is an internal part of the boiler where combustion of fuel takes place. Due to it’s internal design, most of the radiative combustion heat is transferred to the surrounding water and only small amount of heat is lost to the environment which can also be taken care using various techniques.

The other term mentioned in the topic is the smoke tube, which means that the flue gases or smoke travel inside the tubes at high velocities thereby transferring convective heat to water. Generally, tube passes are made in a boiler in order to achieve high heat transfer rates. On the basis of heat transfer rates, the heat transfer area is designed to achieve desired boiler capacity.

Types Of Internal Furnace Smoke Tube Boilers

The Internal furnace smoke tube boilers can be further divided into 3 types:

  1. Dry Back
  2. Semi Wet Back
  3. Fully Wet Back.

Dry Back Boilers

In dry back boilers, the rear end of the furnace (smoke box as well as the side plates) from which the flue gases reverse its path is exposed to the surrounding environment due to which the radiation losses to the surrounding are little more.

Semi-Wet Back Boilers

In semi-wet back boilers, the side shell of the wrapper drum which is connected to the furnace is surrounded by water while the rear end of the wrapper drum is exposed to the outside environment. These types of boiler also have radiation losses but are less as compared to dry back boilers.

Fully Wet Back Boilers

The third and the most energy efficient boilers are the fully wet back boilers in which the whole wrapper drum which is connected to the furnace from where the flue gases reverse its path is surrounded by water and so there are minimum or no radiation losses to the surrounding.

Internal Furnace Smoke Tube Boilers: Our Products

We at Thermodyne Engineering Systems are the leading boiler manufacturers of Internal furnace smoke tube Boilers.

Following is the list of our Intech models:

  1. Intech Dry Back
  2. Intech Semi-Wet Back
  3. Intech Fully-Wet Back

Intech Model Features:

  • Intech is skid mounted design and so no special foundation work is required. This saves a lot of cost and space.
  • Since there is no external furnace in these kinds of boilers so no brickwork is required at the site. This also saves a lot of cost and time.
  • Our Intech models provide early paybacks during operation, because of its compact and internal furnace design heat losses are very low and so provide high fuel efficiency.
  • Our Intech boilers are rigid boilers which have a long operation life and also require very less maintenance.

Thermodyne  is a trusted name in Indian Steam Boiler Industry. Backed by more than 15 Yrs of experience and 800+ installations across all major industry segments using boilers.

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