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Iso-density seaweed biomass circulating fluid bed burn processing method

A technology of circulating fluidized bed and treatment method, which is applied in the field of bioengineering and energy, can solve the problems that the research on combustion treatment is still blank, achieve huge market potential and social and economic benefits, increase the slagging temperature, and avoid high-temperature slagging Effect

Inactive Publication Date: 2010-01-20
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the data show that the research on different-density circulating fluidized bed combustion treatment of biomass with great potential such as seaweed is still blank.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. First, according to the industrial requirements and the analysis of the ash melting point and calorific value of seaweed, the ash melting point is not lower than 1000 degrees, and the low calorific value is greater than 6MJ kg -1 The seaweed varieties are collected, and then the collected seaweed is dried and crushed, and pressed into granules.

[0017] 2. Quartz sand and limestone are mixed to form the media material of the circular fluidized bed with different densities. The particle size and gradation of the media material are: 5% for the mass fraction of 0.28mm-1mm, and 35% for the mass fraction of 1mm-2mm. The mass fraction of 2mm to 3mm is 50%, and the mass fraction of 3mm to 4mm is 10%. The proportion of limestone is determined by the sulfur content of seaweed, and the molar ratio of calcium to sulfur is about 2. The media material is sent to the bottom of the circulating fluidized bed combustion chamber with a media material replenishing device, and the thick...

Embodiment 2

[0022] 1. First, according to the industrial requirements and the analysis of the ash melting point and calorific value of seaweed, the ash melting point is not lower than 1000 degrees, and the low calorific value is greater than 6MJ kg -1 Seaweed varieties, and then dry and pulverize the collected seaweed, cut into small pieces by slicer, the maximum side length of seaweed slice is about 45mm.

[0023] 2. Quartz sand and limestone are mixed to form the media material of the circular fluidized bed with different densities. The particle size and gradation of the media material are: 0.28mm-1mm mass fraction is 8%, 1mm-2mm mass fraction is 45%, The mass fraction of 2mm to 3mm is 40%, and the mass fraction of 3mm to 4mm is 7%. The proportion of limestone is determined by the sulfur content of seaweed, and the molar ratio of calcium to sulfur is about 3. The media material is fed into the bottom of the circulating fluidized bed combustion chamber by the media material replenishing ...

Embodiment 3

[0028] 1. First, according to the industrial requirements and the analysis of the ash melting point and calorific value of seaweed, the ash melting point is not lower than 1000 degrees, and the low calorific value is greater than 6MJ kg -1 The seaweed varieties are collected, and then the collected seaweed is dried and crushed, and pressed into granules.

[0029] 2. Quartz sand and limestone are mixed to form the media material of the circular fluidized bed with different densities. The particle size and gradation of the media material are: 10% of the mass fraction of 0.28mm to 1mm, and 40% of the mass fraction of 1mm to 2mm. The mass fraction of 2mm to 3mm is 40%, and the mass fraction of 3mm to 4mm is 10%. The proportion of limestone is determined by the sulfur content of seaweed, and the molar ratio of calcium to sulfur is about 4. The media material is sent to the bottom of the circulating fluidized bed combustion chamber with a media material replenishment device, and the...

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Abstract

The invention relates to a differential density circulating fluidized bed combustion method for treating seaweed biomaterial, which adopts the mixture of quartz sand and limestone to constitute the medium of the differential density circulating fluidized bed and feeds seaweed grains or slices into the fluidized bed for combustion. The seaweed is broken and abraded during the combustion, and fine particles are brought into a dilute-phase region on the upper part for combustion from a dense-phase region by hot smoke and air. The large seaweed grains and the medium, which are brought out and are abraded incompletely, are separated and caught by a separating burnout feedback device arranged at the outlet of a fluidized bed combustor, and then return to the dense-phase region on the lower part of the combustor to realize circular combustion. Accordingly, the combustion efficiency is improved and the medium loss is reduced. The combustion temperature of the fluidized bed is controlled between 650 DEG C and 950 DEG C; the generation of heat NOX is controlled and the seaweed is prevented from forming slag inside the fluidized bed. The cinder generated after combustion is used to manufacture agricultural fertilizer. The heat generated in combustion provides heat as a heater after the heating working medium or provides power source for a steam turbine to produce kinetic energy which can push the dynamo to generate power.

Description

technical field [0001] The invention relates to a different-density circulating fluidized bed combustion treatment method for seaweed biomass, which is used for clean energy utilization of a large amount of surplus seaweed after being used for economical industrial development in coastal areas or seaweed tailings generated in the production process. It belongs to the field of bioengineering and energy. Background technique [0002] There is a rich "green" renewable energy in nature: biomass energy, which accounts for 14% of the world's total energy consumption, second only to oil, coal and natural gas (biomass energy application research status and development prospects. Forest product chemistry and industry , 2002, No. 2, pp. 75-80). The carrier of biomass energy is biomass. Biomass refers to any renewable or recyclable organic matter (excluding perennial timber forests), mainly including firewood, agricultural and forestry crops, weeds, urban solid waste, domestic sewage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G7/02F23C10/01
CPCY02E20/12
Inventor 王爽姜秀民韩向新王辉刘建国
Owner SHANGHAI JIAOTONG UNIV
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