A combustion system for fluidized bed gasification fly ash

Abstract

The invention discloses a combustion recycling system for gasified fly ash of a fluidized bed. The combustion recycling system for the gasified fly ash of the fluidized bed comprises a first fuel bin, a cyclone separator, a limestone bin and an air film separator, wherein the first fuel bin is arranged on the upper portion of a furnace hearth, and conveys fuel through a gradual enlargement pipeline to a boundary position of a furnace hearth dense phase zone and a furnace hearth lean phase zone, an inlet of the cyclone separator is connected with an outlet of the furnace hearth, an outlet of the cyclone separator is connected with an inlet of an ash bucket, an outlet of a gasified fly ash bin is connected with the ash bucket, an air blower is connected with the ash bucket, an outlet of the ash bucket is connected with the downside dense phase of the furnace hearth, the limestone bin is connected with the middle of the furnace hearth, a second fuel bin is connected with the downside dense phase zone of the furnace hearth, a downside wind distribution plate is arranged on an inclined plane on the bottom side of the furnace hearth, a bottom wind distribution plate is arranged at the bottom of the furnace hearth, the air film separator is arranged on the lower side of the exterior of the furnace hearth, an inlet of the air film separator is connected with an outlet of an air compressor, and an outlet of the air film separator is respectively connected with an over fire air pipeline, the bottom wind distribution plate and the downside wind distribution plate. The combustion recycling system for the gasified fly ash of the fluidized bed can achieve efficient consumption of the gasified fly ash in a circulating fluidized bed boiler, and reduces fuel consumption and NOx discharge amount of the circulating fluidized bed boiler on the premise of effectively using the gasified fly ash.

Description

technical field [0001] The invention belongs to the field of energy saving and emission reduction in thermal power generation, and in particular relates to a combustion system of fluidized bed gasification fly ash, which is used for recycling waste gas ash produced in the process of coal gasification. Background technique [0002] Coal gasification technology is a clean and efficient technology for coal utilization. Currently, it occupies a large market in coal utilization. However, due to the limitation of the process principle, a large amount of unburned gasification fly ash is produced during the coal gasification process. It is difficult to solve the problem of gasification fly ash. The problem of utilization has great significance for the development of coal gasification process. [0003] Compared with raw coal, gasification fly ash has finer particle size, higher ash content and ignition temperature. Although the ash content has little effect on combustion in general c...

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Problems solved by technology

[0002] Coal gasification technology is a clean and efficient technology for coal utilization. Currently, it occupies a large market in coal utilization. However, due to the limitation of the process principle, a large amount of unburned gasification fly ash is produced during the coal gasification process. It is difficult to solve the problem of gasification fly ash. The problem of utilization has great significance for the development of coal gasification process

[0003] Compared with raw coal, gasification fly ash has finer particle size, higher ash content and ignition temperature. Although the ash content has little effect on combustion in general circulating fluidized bed boilers, the combustion temperature cannot meet the requirements, making it difficult to burn out.

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