What are the structural forms and advantages of water tube boilers?

1. The structure of water tube boiler

Straight water tube boiler:

uses straight water tubes as the main heat exchange element.

Bent water tube boiler:

uses bent water tubes to improve heat exchange efficiency and compactness of structure.

D-type structure:

The burner of the water tube boiler of this structure is installed horizontally, which makes operation and maintenance more convenient. At the same time, its width and height are small, and the layout of the heating surface has a large margin along the length direction, which is conducive to quick installation and assembly production. The D-type structure is more flexible in arranging superheaters and economizers, so it is used more in practical applications.

A-type structure:

Similar to the D-type, the A-type boiler also has the characteristics of horizontal installation of the burner and convenient operation and maintenance, but the specific design and layout may be different.

O-type structure:

The O-type boiler also uses a horizontally installed burner, with a compact overall structure and easy management and maintenance.

Corner tube structure:

The corner tube boiler adopts a self-supporting structure, that is, the drum is supported at the bottom by a large-diameter downcomer located at the bottom of both ends, without a separate frame support or suspension. This structure is compact and the appearance is simple. In addition, the corner tube boiler also uses a membrane water-cooled wall, and the furnace is a box body welded as a whole by the water-cooled wall, which can reduce air leakage and does not require bulky refractory and insulation brick walls.

2. Advantages of water tube boilers

Structural flexibility and adaptability:

The furnace of the water tube boiler is placed outside the drum, and the volume of the furnace can be large or small, which can meet the requirements of different combustion and increased evaporation. This makes the water tube boiler more flexible in adapting to different working conditions and user needs.

Heat transfer performance and safety performance:

The drum of the water tube boiler is generally not directly heated, but the tube containing water vapor is placed in the furnace and flue as the heating surface. This design significantly improves the heat transfer performance and improves the safety performance.

High evaporation efficiency:

Due to the fluid circulation inside the water tube, the evaporation efficiency of the water tube boiler is high, which can quickly respond to load changes and meet the user's immediate demand for steam.

High thermal efficiency:

The structural design of the water tube boiler makes it have a high thermal efficiency, which can effectively utilize the heat energy generated by the fuel and reduce energy waste.

Environmental protection:

With the development of technology, water tube boilers have also made significant improvements in dust removal and desulfurization. For example, the water droplet water film in the wet and Venturi-water film dust collector can adhere to fly ash, with high dust removal efficiency and can also absorb gaseous pollutants. At the same time, the comprehensive utilization of ash slag also reduces environmental pollution.

Economical:

Although the initial investment of water tube boilers may be high, due to its high efficiency and energy saving characteristics, it can save users a lot of energy costs in the long run. In addition, the maintenance cost of water tube boilers is relatively low because the structure of its single pressure-bearing parts is relatively simple.

With the continuous advancement of technology and the increasing environmental protection requirements, the performance and efficiency of water tube boilers will be further improved. Water tube boilers have been widely used in power generation, oil refining, chemical industry and other fields due to their structural flexibility, high efficiency, safety and environmental protection.