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Biomass pretreatment method

A pretreatment and biomass technology, applied in the fields of biofuels, waste fuels, solid fuels, etc., can solve the problems of difficult to remove ash and slagging, reduce the melting point of straw ash, etc., and achieve uniform heat treatment effect and high heating efficiency.

Pending Publication Date: 2019-01-04
芜湖聚焰生物质能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the straw-like biomass solid briquette fuel is burned in the boiler, the alkali metal and silicon dioxide react to form a eutectic with a low melting point. The existence of the eutectic reduces the melting point of the straw ash, making the straw ash very easy to form a glassy hard slag. Condensation on the inner wall of the boiler, resulting in hard-to-remove ash and slagging problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Pretreatment of biomass

[0022] (1) Cutting or crushing the biomass raw material to obtain debris with a particle size range of 10-60mm;

[0023] (2) Cyclone separation and pulse dust removal are carried out to the gained debris;

[0024] (3) Wash the debris with circulating hot water at 60-75°C, and adjust the moisture content of the debris to 10-30%;

[0025] (4) Heat the obtained wet debris to 80-120°C, and pass CO 2 , set the pressure at 10-15MPa, and release the pressure quickly after 30-120 minutes;

[0026] (5) Microwave drying of wet debris:

[0027] 1) Adjust the microwave radiation power per unit mass to 200-600w / kg wet debris, so that the temperature of the wet debris rises to 70-80°C;

[0028] 2) Adjust the microwave radiation power per unit mass to 0.8-1.2kw / kg wet debris, raise the temperature of the wet debris to 100-120°C, and heat-preserve until the moisture content of the debris is ≤10%;

[0029] (6) Crush the debris to pass 100 mesh. ...

Embodiment 2

[0031] Example 2: Pretreatment of biomass

[0032] Adopt the method of embodiment 1, difference

[0033] In that: the biomass raw material is a mixture composed of bark, branches and leaves.

Embodiment 3

[0034] Example 3: Pretreatment of biomass

[0035] The method of Example 1 is adopted, except that the biomass raw material is bamboo.

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Abstract

The invention relates to the technical field of production of biomass fuels, in particular to a biomass pretreatment method. The biomass pretreatment method comprises the following steps: (1) cuttingoff or breaking biomass raw materials to obtain chippings with the particle size range being 10-60 mm; (2) carrying out cyclone separation and pulse dust removal treatment on the obtained chippings; (3) washing the chippings with circulating water, and adjusting the water content of the chippings to be 10-30%; (4) carrying out supercritical CO2 explosion treatment on the obtained wet chippings; (5) carrying out microwave drying treatment on the wet chippings until the water content of the chippings is less than or equal to 10%; and (6) crushing the chippings until the meshes of the chippings are 100. By hydro-thermal treatment and supercritical explosion treatment, impurities are removed, the content of an alkali metal element is reduced, wood fibers are softened, thus, slag-bonding is relieved, and feeding is facilitated.

Description

technical field [0001] The invention relates to the technical field of biomass fuel production, in particular to a biomass pretreatment method. Background technique [0002] Biomass shaped solid fuel is an environmentally friendly fuel with wide application prospects. Its production process includes crushing, impurity removal, extrusion, drying, cooling, quality inspection, packaging and other steps. At present, there are the following problems to be solved in the production process of biomass briquetted solid fuel: one is that in the process of collecting and transporting lignin raw materials, it is inevitable that SiO 2 At the same time, the crop straw will absorb a certain amount of alkali metal elements during the growth process, and these elements exist in the biomass body in the form of salts or oxides. When the straw-like biomass solid briquette fuel is burned in the boiler, the alkali metal and silicon dioxide react to form a eutectic with a low melting point. The e...

Claims

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Application Information

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IPC IPC(8): C10L5/40C10L5/44
CPCC10L5/40C10L5/44Y02E50/10Y02E50/30
Inventor 沈显华
Owner 芜湖聚焰生物质能源科技有限公司
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