DHL Series Corner Tube Boiler

The DHL series corner tube boiler is a high-efficiency, large-capacity steam or hot water boiler, renowned for its unique structural design and fuel flexibility.

Design Features and Advantages

1. Self-Supporting Structure

The bent corner tubes and interlocking wall panels create a rigid, box-like structure that is inherently strong.

2. Excellent Thermo-elasticity

The design allows for natural and uniform expansion and contraction of the entire furnace when heating up and cooling down.

3. High Reliability & Safety

The welded membrane wall construction ensures a gas-tight furnace. The robust design can handle pressure fluctuations and slagging.

4. Large Furnace Volume

The design naturally facilitates a spacious furnace.

5. Excellent Fuel Flexibility

The large furnace and adaptable grate system are designed to handle a wide range of fuel sizes and moisture contents. 

Typical Configuration for Coal/Biomass Firing

A DHL corner tube boiler for these fuels is typically a packaged water tube boiler with the following components:

1. Furnace: The large, water-cooled chamber lined with the corner tube walls.

2. Grate System: Usually, a chain grate or traveling grate stoker is installed at the bottom of the furnace. This mechanical grate continuously feeds fuel from the front and moves ash out the back, allowing for stable and automated combustion.

3. Combustion Air System: Air is supplied as Primary Air (under the grate, for fuel bed combustion) and Secondary Air (above the grate, for burning volatile gases and creating turbulence for complete combustion).

4. Convection Section: Located after the furnace, this area contains banks of tubes where hotter flue gases transfer heat to the water/steam, further increasing efficiency.

5. Fuel Feeding System: Consists of a hopper and a conveyor that automatically feeds coal or biomass onto the moving grate.

6. Dust Collection & Ash Handling: Multistage dust collectors (Cyclones, Bag Filters) are used. Separate systems often handle fly ash (from the convection pass) and bottom ash (from the grate).