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Fluidized bed biomass boiler and system capable of preventing air pre-heater from low-temperature corrosion

An air preheater, biomass boiler technology, applied in the direction of preheating, steam boiler, feed water heater, etc., can solve problems such as low temperature corrosion

Inactive Publication Date: 2017-05-31
JIANGLIAN HEAVY IND GRP CO LTD
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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 prevent the low-temperature corrosion system of the air preheater through the biomass fluidized direct-fired boiler, to solve the low-temperature corrosion of the final stage air preheater tube of the high-low differential fluidized bed boiler burning biomass fuel, and to reduce the emission The low-temperature corrosion problem of the final heating surface caused by the increase of the boiler thermal efficiency due to the flue gas temperature

Method used

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  • Fluidized bed biomass boiler and system capable of preventing air pre-heater from low-temperature corrosion
  • Fluidized bed biomass boiler and system capable of preventing air pre-heater from low-temperature corrosion
  • Fluidized bed biomass boiler and system capable of preventing air pre-heater from low-temperature corrosion

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specific Embodiment approach 1

[0036] Specific implementation mode one: combine figure 1 Explain, the air preheater low-temperature corrosion prevention fluidized bed biomass boiler and system with material external circulation belt separator 13 and feeder 14 in this embodiment, the system includes a high-speed bed air chamber 1, a low-speed bed air chamber 2. V-shaped slag discharger 3. High-speed bed V-shaped air distribution plate 4. Low-speed bed air distribution plate 5. Soaking heating surface 6. Secondary air pipe 7. Feeding pipe 8. Regulating valve 9. Furnace chamber 10. Drum 11. Three-stage superheater 12, separator 13, feeder 14, steam collector 15, secondary superheater 16, horizontal flue ash collection hopper 17, ash discharge pipe 18, primary superheater 20, high temperature province Coal heater 21, high temperature air preheater 22, low temperature economizer 23, medium temperature air preheater 24, flue gas feed water heater 25, gas water air preheater 26, fan 27, high pressure heater 28, bo...

specific Embodiment approach 2

[0039] Specific implementation mode two: combination figure 2 Explain, the air preheater low-temperature corrosion prevention fluidized bed biomass boiler and system with material external circulation belt separator 13 and feeder 14 in this embodiment, the system includes a high-speed bed air chamber 1, a low-speed bed air chamber 2. V-shaped slag discharger 3. High-speed bed V-shaped air distribution plate 4. Low-speed bed air distribution plate 5. Soaking heating surface 6. Secondary air pipe 7. Feeding pipe 8. Regulating valve 9. Furnace chamber 10. Drum 11. Separator 13, feeder 14, steam header 15, secondary superheater 16, horizontal flue ash collecting hopper 17, ash discharge pipe 18, primary superheater 20, high temperature economizer 21, high temperature air Preheater 22, low temperature economizer 23, medium temperature air preheater 24, feed water flue gas heater 25, gas water air preheater 26, fan 27, high pressure heater 28, boiler feed water pump 29, deaerator 3...

specific Embodiment approach 3

[0042] Specific implementation mode three: combination image 3Explain, the air preheater low-temperature corrosion prevention fluidized bed biomass boiler and system with material external circulation belt separator 13 and feeder 14 in this embodiment, the system includes a high-speed bed air chamber 1, a low-speed bed air chamber 2. V-shaped slag discharger 3. High-speed bed V-shaped air distribution plate 4. Low-speed bed air distribution plate 5. Soaking heating surface 6. Secondary air pipe 7. Feeding pipe 8. Regulating valve 9 Furnace chamber 10, Drum 11 , separator 13, feeder 14, steam header 15, secondary superheater 16, horizontal flue ash collecting hopper 17, ash discharge pipe 18, make-up water heater 19, primary superheater 20, high temperature and coal saving 21, high temperature air preheater 22, low temperature economizer 23, medium temperature air preheater 24, flue gas feed water heater 25, gas water air preheater 26, fan 27, high pressure heater 28, boiler f...

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Abstract

The invention relates to a high-low differential fluidized bed boiler and system, which combust biomass fuel and are capable of preventing an air pre-heater from low-temperature corrosion. Cold air is heated by hot water in an air-water air pre-heater and then is conveyed into a medium-temperature air pre-heater distributed on a tail flue of a boiler, so that the temperature of a metal wall of the medium-temperature air pre-heater to be higher than acid dew point temperature of flue gas, and furthermore, the low-temperature corrosion of the air pre-heater is prevented. A flue gas water feeding heater is arranged behind the air pre-heater on the tail flue of the boiler and is used for lowering flue gas temperature; meanwhile, the temperature of the air entering the flue gas water feeding heater is about 100 DEG C so that the low-temperature corrosion on the flue gas water feeding heater is also effectively avoided. The technology adopts a V-shaped air distribution plate so that problems of an existing fluidized bed biomass boiler that slag and coke are formed on a bed surface, and debris including iron nails, iron dust and the like is not easy to discharge and the like can also be effectively solved.

Description

technical field [0001] The invention relates to a fluidized bed biomass boiler and its system, in particular to a low-temperature corrosion prevention system for an air preheater of a high-low differential velocity fluidized bed boiler burning biomass fuel. Background technique [0002] my country has abundant biomass resources and large total reserves that can be developed. As a kind of renewable energy, its efficient development and utilization is in line with the energy policy of energy conservation and emission reduction. At present, biomass power generation mainly adopts two kinds of bed combustion and fluidized bed combustion. Fluidized bed boilers have been well developed due to the advantages of low combustion temperature, wide fuel adaptability, and low pollutant emissions. But at the same time, domestic biomass fuel generally has high water content and contains a large amount of foreign matter impurities, etc., resulting in problems such as high exhaust gas temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B33/18F22B31/00F22B31/08F22D1/36
CPCF22B31/0069F22B31/08F22B33/18F22D1/36
Inventor 杨文李成林徐勇敏
Owner JIANGLIAN HEAVY IND GRP CO LTD
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