Abstract
China's coal-dominated energy structure will not change in a short time. In order to implement the relevant national policies on energy conservation and emission reduction, it is a good response to adopt circulating fluidized bed boilers in coal-fired power stations. Circulating fluidized bed boiler adopts fluidized combustion, which has high reliability and high utilization rate because of its special combustion mode and particle recycling device. For the low calorific value inferior fuel which is difficult to burn in common boiler, CFB boiler also has certain adaptability and compatibility. In this background, this article with coal gangue as the representative of the inferior coal are discussed its application in the circulating fluidized bed boiler, the combustion process, boiler equipment and special fly ash produced by combustion is proposed that often appear in the three aspects of problems, and accordingly put forward the solution and optimization measures, provides reference for the actual process.
Highlights
Circulating fluidized bed combustion technology, a new combustion technology which has been widely built and running in modern thermal power stations, is relatively mature and can achieve clean combustion
Continue to increase the air flow rate, when it exceeds a certain speed, the particles will just be blown out of the combustion chamber, but if a separator is installed at the outlet end to capture solid particles according to their size, the unburned particles can be captured from the flue gas and sent back to the combustion chamber for circular combustion through the return feeder, so that the fuel can be recycled, which is called circulating fluidized bed combustion technology
As most of low-calorific fuels are characterized by their poor quality, various problems will inevitably arise in the combustion process
Summary
Circulating fluidized bed combustion technology, a new combustion technology which has been widely built and running in modern thermal power stations, is relatively mature and can achieve clean combustion. Continue to increase the air flow rate, when it exceeds a certain speed, the particles will just be blown out of the combustion chamber, but if a separator is installed at the outlet end to capture solid particles according to their size, the unburned particles can be captured from the flue gas and sent back to the combustion chamber for circular combustion through the return feeder, so that the fuel can be recycled, which is called circulating fluidized bed combustion technology. Based on the economical operation and the extensive utilization of CFB technology, some coal-fired power stations choose to mix and burn coal with different properties from the design coal, so the combustion conditions in the furnace will deviate from the design value during actual operation. Based on this, taking coal gangue as an example, this paper will discuss the possible problems when burning low calorific value fuel in circulating fluidized bed boiler from three aspects and put forward corresponding solutions
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