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Low-ratio biomass circulating fluidized bed with cooling chamber and pollutant control method thereof

A circulating fluidized bed, low magnification technology, applied in fluidized bed combustion equipment, chemical instruments and methods, combustion methods, etc., can solve the problem of ash on the heated area

Active Publication Date: 2013-02-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low rate biomass circulating fluidized bed boiler with a cooling chamber and a pollutant control method to solve the problem of serious dust accumulation on the heating surface behind the separator when burning biomass with a low ash melting point

Method used

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  • Low-ratio biomass circulating fluidized bed with cooling chamber and pollutant control method thereof
  • Low-ratio biomass circulating fluidized bed with cooling chamber and pollutant control method thereof
  • Low-ratio biomass circulating fluidized bed with cooling chamber and pollutant control method thereof

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specific Embodiment approach 1

[0031] Specific implementation mode one: combine figure 1 , Figure 7 , Figure 10 and Figure 11 Explain that the low rate biomass circulating fluidized bed boiler with a cooling chamber in this embodiment includes a furnace body 10, buried pipes 5, a drum 13, a cyclone separator 14, a flue gas cooling chamber 19, and a tail shaft flue 24. Flue partition wall 25, medium temperature superheater 11, high temperature superheater 15, low temperature superheater 16, economizer 17, air preheater 18, rotating secondary tuyere 8, soot blower 12, feeder 22, First-stage desuperheater 20, second-stage desuperheater 21, SNCR (ammonia injection denitrification) nozzle 28, limestone feed port 29, middle air chamber 1, side air chamber 2, middle air distribution plate 26, side air distribution Plate 27 and slag discharge pipe 23, the drum 13 is arranged on the top of the body of furnace 10,

[0032] The flue gas cooling chamber 19 is vertically provided with a flue partition wall 25, th...

specific Embodiment approach 2

[0034] Specific implementation mode two: combination diagram 2-1 , Figure 2-2 , Figure 8 , Figure 10 and Figure 11 To illustrate, the low rate biomass circulating fluidized bed boiler with a cooling chamber in this embodiment includes a furnace body 10, a cyclone separator 14, a flue gas cooling chamber 19, a buried pipe 5, a tail shaft flue 24, and a flue Partition wall 25, medium temperature superheater 11, high temperature superheater 15, low temperature superheater 16, economizer 17, air preheater 18, rotating secondary tuyere 8, drum 13, soot blower 12, feeder 22, First-stage desuperheater 20, second-stage desuperheater 21, SNCR nozzle 28, limestone feed port 29, middle air chamber 1, side air chamber 2, middle air distribution plate 26, side air distribution plate 27 and slag discharge The pipe 23 and the drum 13 are arranged on the top of the furnace body 10;

[0035] The flue gas cooling chamber 19 is vertically provided with a flue partition wall 25, the top...

specific Embodiment approach 3

[0037] Specific implementation mode three: combination Figure 3-1 , Figure 3-2 and Figure 9-Figure 11 Explain that the low rate biomass circulating fluidized bed boiler with a cooling chamber in this embodiment includes a furnace body 10, a buried pipe 5, a cyclone separator 14, a flue gas cooling chamber 19, a tail shaft flue 24, and a flue Partition wall 25, medium temperature superheater 11, high temperature superheater 15, low temperature superheater 16, economizer 17, air preheater 18, rotating secondary tuyere 8, drum 13, soot blower 12, feeder 22, First-stage desuperheater 20, second-stage desuperheater 21, SNCR nozzle 28, limestone feed port 29, middle air chamber 1, side air chamber 2, middle air distribution plate 26, side air distribution plate 27 and slag discharge The pipe 23 and the drum 13 are arranged on the top of the furnace body 10;

[0038]The flue gas cooling chamber 19 is vertically provided with a flue partition wall 25, the top of the flue gas par...

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Abstract

The invention relates to a low-ratio biomass circulating fluidized bed with a cooling chamber and a pollutant control method thereof and solves the problem that existing grate-fired furnaces and circulating fluidized beds cause grate slag bonding and bed material coking in biomass combustion and especially causes soot formation and high-temperature corrosion in combustion of low ash fusion point biomass. A smoke cooling chamber is disposed behind a cyclone separator and used to lower smoke temperature from 800 DEG C to within 650 DEG C, so that soot formation and corrosion of a superheater are relieved greatly. By in-furnace denitration and limestone desulfuration, denitration efficiency can reach 50-70% when mole ratio of NH3 to NOX is 1.0-1.1, denitration efficiency can reach 70-80% when mole ratio of Ca to S is 2.0-2.5, and emission concentration of SO2 and NOx can be effectively controlled within 100mg / m<3>. The low-ratio biomass circulating fluidized bed with the cooling chamber and the pollutant control method thereof are used to control biomass combustion and pollutants.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler and a pollutant control method, in particular to a low rate biomass circulating fluidized bed boiler burning low ash melting point biomass fuel and a pollutant control method. Background technique [0002] At present, the main types of domestic biomass power generation boilers are layer fired boilers and circulating fluidized bed boilers. Although the layer-fired boiler has simple structure, convenient operation, and relatively low operating costs. However, because the volatile content of biomass is as high as 70-80%, the flame temperature on the surface of the grate is maintained at 1100-1300°C, while the melting point of biomass ash is generally only 900-1100°C, so coking occurs on the surface of the grate, and at the same time, the ash in the fuel Most of the alkali metals and chlorine elements enter the gas phase, and some alkali metals directly form steam, and form complex compounds with...

Claims

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Application Information

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IPC IPC(8): F23C10/10F23C10/22F23C10/18B01D53/75B01D53/60
CPCY02A50/20
Inventor 别如山黄兵宋兴飞刘茜茜纪晓瑜朱少飞陈佩
Owner HARBIN INST OF TECH
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