Biomass boiler system with three-gear mixed-air nozzles

Abstract

The invention discloses a biomass boiler system with three-gear mixed-air nozzles. The biomass boiler system comprises a boiler, an air pre-heater, a multi-tube dust remover, a bag-type dust remover, an induced draft fan, a funnel, a backflow draft fan, a mixer, mixed-air nozzle devices and a secondary air fan. A flue gas exhaust opening of the boiler sequentially communicates with the flue gas side of the air pre-heater, the multi-tube dust remover, the bag-type dust remover, the induced draft fan and the funnel through a flue. A flue gas backflow pipe sequentially communicates with the backflow draft fan, the mixer and the mixed-air nozzle devices in the boiler. The two mixed-air nozzle devices each specifically comprises three mixed-air blowing tubes which are arranged in sequence from top to bottom, valves and the corresponding nozzles, wherein each valve and the corresponding nozzle are arranged on the corresponding mixed-air blowing tube. The biomass boiler system with the three-gear mixed-air nozzles is provided with the three-gear mixed-air nozzle devices including the high-gear, the middle-gear and the low-gear; the functions that the flue gas temperature, the oxygen concentration and the like can be adjusted can be achieved; and the biomass boiler system is better in adaptability and greater in operability.

Description

technical field [0001] The invention relates to the technical field of biomass boiler equipment, in particular to a biomass boiler system with a three-speed mixing air nozzle. Background technique [0002] As we all know, a biomass boiler is a type of boiler. A boiler that uses biomass energy as fuel is called a biomass boiler. It can be roughly divided into biomass steam boilers, biomass hot water boilers, biomass hot air stoves, and biomass heat-conducting oil furnaces. Wait. [0003] During the use of the existing biomass boiler: it is necessary to use the low-temperature and low-oxygen characteristics of flue gas recirculation to spray part of the flue gas into the appropriate position of the furnace again, reduce the temperature of the furnace combustion and control the oxygen content, so as to achieve control The purpose of nitrogen oxides (ie NOx) production. The specific existing flue gas recirculation scheme is: before the air preheater of the boiler, extract a pa...

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Problems solved by technology

[0004] However, the existing technical solutions of the above technologies still have some objective technical shortcomings: for example: before the air preheater, the flue gas temperature is still relatively high, and the flue gas temperature and oxygen concentration cannot be adjusted and controlled

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