What are the configuration principles of chain grate hot water boilers?

　　In recent years, the development of centralized heating in urban areas of our country has been rapid. Due to the advantages of hot water heating systems, such as good heating quality, energy saving, safe operation, and low equipment maintenance costs, they have become the main form of winter heating in northern towns of our country. At the same time, it has also promoted the development and progress of hot water boiler technology, leading it towards large-scale and diversified directions.

　　Due to the limitations of our country's environmental protection standards and considering the operational reliability of combustion equipment, the vast majority of centralized heating hot water boilers in our country are currently large.Chain grateHot water boilers. In actual operation, large chain grate hot water boilers of different structural forms exhibit their own technical characteristics, but also expose various problems. Therefore, how to select the type of large chain grate hot water boiler in the centralized heating system, reasonably configure the boiler capacity, and ensure the safe and efficient operation of the hot water heating system is a concern for heating enterprises. Chain grate.

　　To this end, this article analyzes the types of large chain grate hot water boilers commonly used at present and proposes the principles for selecting the type and capacity distribution of centralized heating large chain grate hot water boilers.

　　(1) The boiler has good hydrodynamic safety. Large-capacity hot water boilers are the heat source for urban centralized heating. If the boiler is shut down due to operational accidents, it will not only cause significant economic losses to the heating unit but also lead to immeasurable indirect losses to the entire heating system and related social units. Hydrodynamic safety is a key issue for ensuring the safe operation of hot water boilers and is also a concern for heating enterprises. However, due to the low operational management level of large-capacity hot water boilers, it is difficult to ensure the water quality of the boiler, and some working fluids carry solid deposits in the heating system that exceed the standard. Relying solely on the natural circulation of the boiler or the water momentum generated by the return water injection cannot carry the solid deposits out of the heating surface of the boiler. Solid deposits usually accumulate in the lower collection box or at the bottom of the steam drum of water-fire tube boilers, leading to water-cooled wall tube bursting, overheating of the metal at the bottom of the shell, and other accidents causing foaming damage. Chain grate.

　　Therefore, the principle of selecting large-capacity hot water boilers must not only ensure hydrodynamic safety when the boiler water quality meets the standards but also ensure safe operation when the boiler water quality is slightly worse. Chain grate.

　　(2) Good coal adaptability. In recent years, coal supply in our country has become increasingly tight, making it difficult for boilers to ensure the operation of the designed coal type for combustion. Therefore, large centralized heating hot water boilers must have a wide range of coal adaptability. Currently, the main types of grates for large centralized heating chain grate hot water boilers in our country are slat chain grates and beam-type.Chain grateTo improve the coal adaptability of the boiler, in addition to ensuring the corresponding grate area, the temperature of the primary air in the combustion system should also be guaranteed. The role of adding an air preheater to the boiler is not only to reduce the flue gas temperature of the boiler and improve the thermal efficiency of the boiler but also to increase the temperature of the primary air, ensuring the timely ignition and efficient combustion of fuel, especially inferior fuels. Therefore, it is a misconception to think that the working medium temperature of hot water boilers is low and that the flue gas temperature is easy to guarantee, thus large chain grate hot water boilers cannot be equipped with air preheaters. Operational practice shows that hot water boilers with a capacity greater than 14MW should be designed and installed with air preheaters.