Abstract
In this paper, a new bell-type air nozzle, which overcomes the structural defects of traditional bell-type air nozzles, is proposed and validated by cold test and numerical simulation. The pressure drop characteristic of the new bell-type air nozzle is measured. Furthermore, the causes of cover outlet abrasion and blockage, inner tube fracture, and irregular resistance change in traditional bell-type air nozzles applied in circulating fluidized bed (CFB) boilers are analyzed. Then, the performance of the new bell-type air nozzle is evaluated in a real CFB boiler, which is operated under regular working conditions. The results show that the new bell-type air nozzle has stronger anti-wear ability, excellent resistance characteristics, longer service life, and easier maintenance.
Highlights
As a mature clean coal power generation technology, the circulating fluidized bed (CFB) boiler has become increasingly applied worldwide [1,2,3,4,5]
Since the pressure drop of the bell-type air nozzle can be adjusted through the structure of the inner tube and cover, the convenience of the design is increased
The bell-type air nozzle has stable performance and obvious technical advantages compared with pig-tail and arrowhead air nozzles, the following problems still exist in the process of application: outlet abrasion, cover blockage, and inner tube fracture
Summary
As a mature clean coal power generation technology, the circulating fluidized bed (CFB) boiler has become increasingly applied worldwide [1,2,3,4,5]. Reasonable air nozzle structure and pressure drop are essential to keep the CFB boiler operating well [13]. The bell-type air nozzle is a structure adopted in CFB boilers [14,15,16]. Compared with pig-tail air nozzles, the bell-type air nozzle has a low pressure drop and low energy consumption. Since the pressure drop of the bell-type air nozzle can be adjusted through the structure of the inner tube and cover, the convenience of the design is increased. The bell-type air nozzle has stable performance and obvious technical advantages compared with pig-tail and arrowhead air nozzles, the following problems still exist in the process of application: outlet abrasion, cover blockage, and inner tube fracture. More in-depth research and optimization of the air nozzle is necessary
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