What Indicators of Refractory Materials are Used in Fluidized Bed Waste Incinerators?
Fluidized bed technology is a general term for a class of incineration technologies based on fluidization. The fluidized bed can be further divided into a bubbling fluidized bed, a circulating fluidized bed and a fast fluidized bed. In the early stage, bubbling fluidized bed was the main development, and it has gradually developed into a circulating fluidized bed. The domestic fluidized bed incineration technology is becoming more and more mature.
The fluidized bed waste incineration system should at least include a garbage feeding device, an ignition device, an air distribution device, an incineration boiler, a supply air system, an air intake system, and other auxiliary devices.
The fluidized bed waste incineration line adopts continuous operation mode. Except for force majeure, the incineration line of the waste incineration plant should be arranged and repaired in an orderly manner to meet the requirements of 365 days of operation throughout the year. The cumulative operating hours of a single furnace incineration line should be greater than 7200h, and should not be less than 8000 hours. If a single furnace incineration line is less than 8000h, the waste incineration plant should adopt the following methods according to the actual situation to ensure the harmless treatment needs of the whole year: (1) set up a spare furnace; (2) amplify the waste storage pit; (3) ) Landfill adjustment.
Incineration Boiler Refractory
The physical and chemical performance index specifications for refractory materials for fluidized bed waste incineration boilers shall be in accordance with YB/T 4108 "Abrasion resistant refractory bricks for circulating fluidized bed boilers" and YB/T 4109 "Abrasion resistant refractory castables for circulating fluidized bed boilers" The requirements of the implementation.
Refractory materials should be selected according to the design requirements of the boiler manufacturing unit to meet the specific requirements of wear resistance and high temperature resistance. After the refractory materials arrive, they should be organized into stocks in time to avoid adverse effects caused by open storage. When the refractory material is installed and used, the corresponding test block shall be made to check the relevant material strength.
The masonry and installation of the refractory material of the fluidized bed incineration boiler must be carried out in strict accordance with the heating curve provided by the refractory manufacturer.
Fluidized bed waste incineration boiler refractories and their masonry are very important. Its wear resistance, sealing performance and thermal insulation performance directly affect the safety of the incineration boiler and the operation of the operating personnel. Boiler furnace wall masonry construction can minimize heat loss, improve the economic efficiency of boiler operation, and prevent the combustion of flue gas in the furnace and flue to cause injury.
At present, there are two standards for refractory materials for circulating fluidized bed boilers, namely metallurgical standards and power industry standards, which are managed by the National Refractory Standardization Technical Committee and the China Power Industry Standardization Technical Committee, namely the two mentioned at the beginning of the article. Standards, YB/T 4108 "Abrasion-resistant refractory bricks for circulating fluidized bed boilers" and YB/T 4109 "Abrasion-resistant refractory castables for circulating fluidized bed boilers", on refractory materials for fluidized bed waste incinerators The physical and chemical performance index specification is not available.
At present, domestic refractories for fluidized bed incineration boilers can be generally classified into three categories according to their functions:
Bricks, castables, plastics and mortars of wear resistant refractory materials.
Refractory bricks, castables and mortars of refractory materials.
3.Bricks, Castables and Mortars of Refractory Insulation Materials.
Commonly used wear-resistant refractory materials are phosphate bricks and castables, sillimanite bricks and castables, silicon carbide bricks and castables; corundum bricks and castables; wear-resistant refractory bricks and castables; and silicon nitride silicon carbide products, etc.
In the current situation where there is no uniform standard for refractory materials for fluidized bed waste incinerators in China, the design unit should use refractory materials superior to conventional circulating fluidized bed combustion boilers in order to achieve wear resistance and resistance. The specific needs of high temperatures.
