Biomass circulating fluid bed burning method and biomass circulating fluid bed boiler

A technology of circulating fluidized bed and combustion method, which is applied in the direction of fluidized bed combustion equipment, combustion method, fuel burned in molten state, etc. It can solve the problems of sticking and slagging on the heating surface, so as to prevent sticking, Improvement of working environment, effect of high steam parameters

Active Publication Date: 2008-01-30
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem that the furnace temperature is higher than the melting point of biomass ash in the conventional circulating fluidized bed combustion technology, and the heating surface in the furnace and the tail is prone to sticking and slagging. Biomass fuels, especially biomass circulating fluidized bed boilers in which the proportion of biomass fuels to the total fuel volume is not less than 80% based on calorific value, can control the temperature of the heating surface of the boiler below the melting point of biomass ash, Effectively prevent ash accumulation and slagging to ensure efficient and reliable operation of the boiler

Method used

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  • Biomass circulating fluid bed burning method and biomass circulating fluid bed boiler

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Embodiment 1

[0059] According to the present invention, the biomass circulating fluidized bed boiler shown in Figure 1 includes a furnace 1, a separator 2, a feeder 3, and a tail flue 4, with a straight section 11, a feed port 101, and a coal filling port 102, biomass feeding port 104, superheater high temperature section 12, separator material leg 21, superheater low temperature section 41, evaporation heating surface 42, economizer 43 and air preheater 44;

[0060] The fuel used is corn stalks and rice stalks, and a small amount of coal is mixed with it. The steam parameters are high temperature and high pressure.

[0061] The upper part of the furnace 1 is equipped with a two-stage steam-cooled screen-type heating surface as the high-temperature section 12 of the superheater, which absorbs the heat of the flue gas at the upper part of the furnace 1, and reduces the temperature of the flue gas at the outlet of the furnace 1 to 700-800 ° C; Heating surface 42, low-temperature section 41 o...

Embodiment 2

[0064] According to the present invention, the biomass circulating fluidized bed boiler shown in Figure 2 includes a furnace 1, a separator 2, a feeder 3, and a tail flue 4, with a straight section 11, a feed return port 101, and a bed material feeding Port 103, biomass feeding port 104, superheater high temperature section 12, panel water cooling heating surface 13, separator material leg 21, air preheater 44, particle ash removal device 45, first stage 411 of superheater low temperature section, superheating The second stage 412 of the low temperature section of the economizer, the desuperheating device 413 between the stages, the boiling section 431 and the non-boiling section 432 of the economizer;

[0065] The fuel used is straw, and the steam parameters are medium temperature and medium pressure.

[0066] Since the ash melting point of wheat straw is lower than 700°C, the water-cooled panel-type heating surface 13 on the upper part of the furnace 1 and the steam-cooled p...

Embodiment 3

[0070] According to the present invention, the biomass circulating fluidized bed boiler as shown in Figure 3 includes a furnace 1, a separator 2, a feeder 3, and a tail flue 4, with a straight section 11, a feed return port 101, and bed material feeding Port 103, biomass feeding port 104, superheater high temperature section 12, panel water cooling heating surface 13, separator material leg 21, air preheater 44, superheater low temperature section 41, economizer boiling section 431 and non-boiling section 432;

[0071] The fuel used is corn stalks, and the steam parameters are sub-high temperature and sub-high pressure.

[0072]The upper part of the furnace 1 is equipped with a water-cooled panel-type heating surface 13 and a steam-cooled panel-type heating surface as the high-temperature section 12 of the superheater to absorb the heat of the flue gas at the upper part of the furnace 1 and reduce the temperature of the flue gas at the outlet of the furnace 1 to 600-700 °C; th...

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Abstract

The invention discloses a biological circulation fluidized bed combustion method and a biological fueled circulation fluidized bed boiler; the fluidized bed boiler comprises a boiler cavity, a clutch, a material refeeder, a tail chimney, wherein, the boiler cavity is provided with a superheater high temperature section, and the tail chimney is provided with a superheater low temperature section. Through the arrangement of heating surfaces of the boiler cavity and the tail chimney and other auxiliary measures, the temperature of the upper part of the boiler cavity is controlled at 550 to 800 DEG C, the outlet steam temperature of the tail heating surface is controlled at 350 to 400 DEG C, so as to solve the problem that: the temperature distribution of the boiler cavity is unreasonable, and the material concentration of the lower part of the boiler cavity is too low when the biological fuels are combusted in the circulation fluidized bed based on the stable fire, complete consumption of biological fuels , so that the temperature distribution in the boiler cavity tends to be equalized and the boiler cavity can be prevented from clinkering, and the accumulated ashes on the heating surfaces can also be prevented from being clinkered, furthermore, the boiler output capacity can be ensured, and a high steam parameter can also be achieved to ensure the generation efficiency.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a circulating fluidized bed boiler burning biomass fuel. Background technique [0002] Biomass energy is an ideal renewable energy. Compared with fossil fuels, biomass energy has the advantages of renewability, low pollution, and can effectively reduce the greenhouse effect. The use of biomass energy to generate electricity is one of the important ways of biomass utilization. Because circulating fluidized bed boiler has the advantages of wide fuel adaptability and superior environmental protection characteristics, its application in biomass power generation is attracting more and more attention. [0003] In conventional coal-fired circulating fluidized bed boilers, the flue gas design temperature at the furnace outlet is usually 850-900°C to meet the needs of complete coal combustion. After the flue gas is separated from the high-temperature circulating ash by the cyclone s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/00
Inventor 吕清刚贠小银王东宇高鸣那永洁包绍麟孙运凯贺军矫维红
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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