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Iso-denseness seaweed biomass circulating fluid bed burn processing method

A technology of circulating fluidized bed and treatment method, which is applied in the fields of bioengineering and energy, can solve the problems of blank combustion treatment research, achieve huge market potential, social and economic benefits, simple desulfurization system, and high combustion efficiency

Inactive Publication Date: 2008-05-21
SHANGHAI JIAO TONG 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, choose the ash melting point not lower than 1000 degrees, and the low calorific value is greater than 6MJ·kg -1 Then the collected seaweed is dried and crushed, and pressed into granules.

[0017] 2. Quartz sand and limestone are used to form media materials of different density circulating fluidized beds. The particle size and gradation of media materials are: 0.28mm~1mm mass share is 5%, 1mm~2mm mass share is 35%, The mass proportion of 2mm-3mm is 50%, and the mass proportion of 3mm-4mm is 10%; the proportion of limestone is determined by the sulfur content of seaweed, and the calcium-sulfur molar ratio is about 2. The media material is fed into the bottom of the circulating fluidized bed combustion chamber with the media material replenishing device, and the thickness of the static bed material layer is 650mm.

[0018] 3. Use an external heat ...

Embodiment 2

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

[0023] 2. Quartz sand and limestone are used to form the media material of different density circulating fluidized bed. The particle size and gradation of the media material are: 0.28mm~1mm mass share is 8%, 1mm~2mm mass share is 45%, The mass proportion of 2mm to 3mm is 40%, and the mass proportion 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 with the media material replenishing device, and...

Embodiment 3

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

[0029] 2. Quartz sand and limestone are mixed to form media materials of different density circulating fluidized beds. The particle size and gradation of media materials are: 0.28mm~1mm mass share is 10%, 1mm~2mm mass share is 40%, The mass proportion of 2mm to 3mm is 40%, and the mass proportion 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 fed into the bottom of the circulating fluidized bed combustion chamber with the media material replenishing device, and the thickness of the static bed material layer is 250mm.

[0030] 3. Use an ...

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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 uses clean energy for a large amount of surplus seaweed or seaweed tailings generated in the production process after being used for economical industrial development in coastal areas. It belongs to the field of bioengineering and energy. Background technique [0002] There is a rich "green" renewable energy in nature: biomass energy, accounting for 14% of the world's total energy consumption, second only to oil, coal and natural gas (Research Status and Development Prospects of Biomass Energy Applications. Forest Products 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 fuelwood, agricultural and forestry crops, weeds, municipal solid waste, domestic sewage, aquatic pla...

Claims

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Application Information

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IPC IPC(8): F23G7/02F23C10/01
CPCY02E20/12
Inventor 王爽姜秀民韩向新王辉刘建国
Owner SHANGHAI JIAO TONG UNIV
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