Water tube boiler refers to an
Industrial Boiler in which a combustion chamber and a heating surface are set outside the drum, causing water and steam to flow in the tube. The structure is more complicated, the soda system mainly includes drum (drum), header, water wall, convection pipe, economizer and superheater, etc.; the combustion system mainly includes burner, furnace and flue, air preheater, etc. . At present, the water-tube boilers produced by Yuanda are the most popular SZS gas-fired boilers and SZL series biomass boilers. Compared with fire-tube boilers, they do not have large-diameter drums in structure, and the elastic curved water pipes replace the straight smoke pipes. Not only saves metal, but also creates conditions for improving boiler capacity and steam parameters.
The specific advantages of water tube boilers are:
1. The furnace of the water-tube boiler is placed outside the cylinder, and the volume of the furnace can be large or small, which can meet the requirements of combustion and increased evaporation.
2. The drum of the water-tube boiler is generally not directly heated, and the tube containing the water vapor is placed in the furnace and the flue as the heating surface, and the heat transfer performance and safety performance are significantly improved.
3. The water preheating, soda water and steam superheating of the water tube boiler are completed in the heating surface economizer, water wall and convection tube bundle, and superheater.
4. The water vapor system, combustion system and auxiliary system of the water-tube boiler are relatively complex, but the structure of a single pressure-bearing component of the water-tube boiler is relatively simple.
5. Because the preheating of water, the superheating of soda water and steam are all completed in the tube, the scaling of the tube is difficult to remove, so the water tube boiler has higher requirements on water quality, and higher requirements on operation, operation and management.
