Guide: With the adjustment of industrial structure in large and medium-sized cities, the transformation of old districts and the construction of industrial zones, the implementation of the coal ban policy in central urban areas, and the implementation of energy-saving and emission reduction policies such as regional central heating and cogeneration, the proportion of small and medium-sized coal-fired boilers Will drop significantly
With the adjustment of industrial structure in large and medium-sized cities, the transformation of old districts and the construction of industrial zones, the implementation of the coal ban policy in central urban areas, and the implementation of energy-saving and emission reduction policies such as regional central heating and cogeneration, the proportion of small and medium-sized coal-fired boilers Will decline significantly, and is now moving towards the direction of large capacity, high parameters, high energy efficiency, and low emissions; coal-fired boilers will be mainly stratified furnaces, that is, chain grate boilers will be mainly used, and the direction will be large capacity and high parameters. Development cannot be replaced by any other coal-fired boiler; boilers that use clean combustion technology such as large-capacity circulating fluidized bed boilers (35t/h) have advantages in burning low-quality coal, energy saving, and environmental protection, and will get faster The development of oil and gas boilers will develop into condensing low-nitrogen boilers.
Generally, the sequence of the interlocking relationship of the auxiliary equipment of the circulating fluidized bed boiler is: high pressure fluidized fan, induced draft fan, primary fan, secondary fan, coal seeding fan, coal feeder, etc. But it should be said that it is better to place the high-pressure fluidized fan before the induced draft fan, which can prevent the feeder from clogging.
In the cold state of the industrial boiler, the water in the evaporation system below the water level of the drum is still. When the riser tube is heated in the boiler, part of the water generates steam, forming a steam-water mixture with a lower density. The downcomer is not heated outside the furnace, and the water density in the tube is relatively high. This produces a driving force under the action of the density difference between the two. The steam-water mixture flows upwards in the water wall and enters the steam drum through the upper header and the duct. The water from the steam drum in the downcomer flows downwards and is replenished into the water wall through the lower header. In this way, the continuous circulating flow forms the natural circulation and the volumetric heat load of the boiler furnace.
Xinli Boiler designed the technical scheme of SZS series gas superheated steam boiler system for it, and the steam temperature can be increased to 300℃ through the superheater. What’s more worth mentioning is that the SZS series gas boiler consists of a full-membrane water-cooled wall to form a large-volume furnace space. While obtaining better heat preservation performance, it ensures full combustion of fuel. Combined with an advanced low-nitrogen burner, it can easily achieve NOx. Low emission of less than 30mg/m3. In addition, in order to further ensure the safety and normal operation of the boiler, the Xinli boiler will undergo rigorous water pressure test and air tightness test before leaving the factory, which is also a strong guarantee for the quality of Xinli.