Biomass circulating fluidized bed boiler

Abstract

The invention relates to a biomass circulating fluidized bed boiler. The biomass circulating fluidized bed boiler comprises a hearth with a rectangular section and is characterized in that a water wall is arranged on the outer side wall of the hearth, and the water wall is arranged on the side wall of the hearth in a covering mode; an air supply air channel is fixedly installed on the hearth, theair supply air channel communicates with the interior of the hearth, and the air supply air channel comprises a primary air supply air channel and a second air supply air channel; and the second air supply air channel comprises a secondary air mother pipe, a first-stage air channel with an annular structure and a second-stage air channel with an annular structure, the first-stage air channel and the second-stage air channel are arranged on the side wall of the hearth in a covering mode, the first-stage air channel is located below the second-stage air channel, wherein the first-stage air channel and the second-stage air channel communicate with the secondary air mother pipe. According to the biomass circulating fluidized bed boiler, by additionally arranged the first-stage air channel andthe second-stage air channel, generation of nitrogen oxides during biomass burning is reduced, sufficient burning is promoted to reduce the accumulation of ashes, and a fly ash phenomenon is prevented.

Description

technical field [0001] The invention relates to the related technical field of fluidized bed boilers, in particular to a biomass circulating fluidized bed boiler. Background technique [0002] The emission control of nitrogen oxides in biomass power plants is strictly required by the national environmental protection. At present, most of the boilers out of stock use SNCR denitrification. The clean and denitrification technology of nitrogen and water is greatly affected by the boiler. [0003] The current circulating fluidized bed furnace temperature is below 800°C, while the optimal temperature for SNCR denitrification is above 850°C, resulting in low denitrification efficiency, a large increase in the amount of chemicals used, resulting in wear and tear on the boiler and increased ash, which is harmful to the safe and efficient operation of the boiler caused hindrance. [0004] At the same time, the current boilers have uneven heating of the incoming air, which leads to t...

AI Technical Summary

Problems solved by technology

[0003] The current circulating fluidized bed furnace temperature is below 800°C, while the optimal temperature for SNCR denitrification is above 850°C, resulting in low denitrification efficiency, a large increase in the amount of chemicals used, resulting in wear and tear on the boiler and increased ash, which is harmful to the safe and efficient operation of the boiler caused a hindrance

[0004] At the same time, the current boilers have uneven heating of the incoming air, which leads to thermal deviation, which makes the furnace unable to fully burn, resulting in increased ash and slag. At the same time, the uneven wind will lead to increased fly ash and pollute the environment.

Images