Biomass pyrolysis liquefied fuel oil technology

A biomass thermal cracking and biomass technology, which is applied in the field of biomass preparation of bio-oil, can solve the problems of high oxygen content, high bio-oil viscosity and high cost, and achieve high oil quality, high energy density, and increased yield. Effect

Inactive Publication Date: 2011-12-14
青岛福瑞斯生物能源科技开发有限公司
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Problems solved by technology

[0005] The common problems of existing biomass pyrolysis technology are low biomass pyrolysis efficiency, high cost, high viscosity, high oxygen content, poor stability and poor quality of bio-oil: high density (about 1200Kg / m^3); strong acidity (pH value is 2.8~3.8); high moisture content (15%~30%) and low calorific value (14~18.5MJ / Kg), affect the combustion performance

Method used

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  • Biomass pyrolysis liquefied fuel oil technology

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Effect test

specific Embodiment 1

[0016] Specific embodiment 1: take corn stalk as example:

[0017] A biomass pyrolysis liquefied fuel oil technology, comprising the following process steps:

[0018] (1) Pretreatment of corn stalks:

[0019] Water, 5mol / L hydrochloric acid, and hydrofluoric acid are used to configure the soaking solution according to the volume ratio of 20:1:0.5, and the corn stalks are soaked in the soaking medium for 30 minutes. Drying the corn stalks so that the moisture content of the corn stalks is dried to less than 8% of the corn stalks mass; cutting the dried corn stalks into lengths of 3-5mm;

[0020] (2) Thermal cracking of corn stalks

[0021] Transport the cut corn stalks to the fluidized bed, control the feed rate at 20kg / h, crack under anaerobic conditions at 500°C, adjust the flow rate of the carrier gas, and control the residence time of the cracked gas between 0.8s, and the pyrolysis gas leaves the reaction After entering the cyclone separator, the charcoal is separated by...

specific Embodiment 2

[0024] Specific embodiment 2: take wheat straw as example:

[0025] A biomass pyrolysis liquefied fuel oil technology, comprising the following process steps:

[0026] (1) Wheat straw pretreatment:

[0027] Water, 5mol / L hydrochloric acid, and hydrofluoric acid are used to configure the soaking solution according to the volume ratio of 20:1:0.5, and the wheat straw is placed in the soaking medium for 30 minutes, and the liquid surface is submerged in the wheat straw to remove ash; dry the wheat straw so that the moisture content of the wheat straw is dried to less than 8% of the wheat straw mass; the dried wheat straw is cut into a length of 3-5mm;

[0028] (2) Pyrolysis of wheat straw

[0029] Transport the cut wheat straw to the fluidized bed, control the feed rate at 200kg / h, crack under anaerobic conditions at 650°C, adjust the flow rate of the carrier gas, and control the residence time of the cracked gas between 1.2s, and the pyrolysis gas leaves the reaction After en...

specific Embodiment 3

[0032] Specific embodiment 3: take peanut shell as example:

[0033] A biomass pyrolysis liquefied fuel oil technology, comprising the following process steps:

[0034] (1) Peanut shell pretreatment:

[0035] Water, 5mol / L hydrochloric acid, and hydrofluoric acid are used to prepare the soaking liquid according to the volume ratio of 20:1:0.5, and the peanut shells are placed in the soaking water for 30 minutes. Dry the peanut shells so that the moisture content of the peanut shells is dried to be lower than 8% of the mass of the peanut shells; the dried peanut shells are cut into lengths of 3-5mm;

[0036] (2) Pyrolysis of peanut shells

[0037] Transport the cut peanut shells to the fluidized bed, control the feed rate at 100kg / h, crack under anaerobic conditions at 550°C, adjust the flow rate of the carrier gas, control the residence time of the cracked gas between 1s, and the pyrolysis gas leaves the reactor Finally, it enters the cyclone separator, relying on centrifug...

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Abstract

The invention relates to the biomass thermal cracking liquefying fuel oil technology, which comprises the following process steps: (1) preprocessing biomass, namely preparing soak solution from water, 5 mol/L of hydrochloric acid and hydrofluoric acid in a volume ratio of 20:1:0.5, soaking for 30 minutes, and removing ash content; (2) performing thermal cracking of the biomass; and (3) refining biological oil, namely performing catalytic cracking on the prepared heavy biological oil, preheating the heavy biological oil to the temperature of 400 DEG C, and keeping the temperature of between 410 and 490 DEG C in a fixed bed reactor, wherein a catalyst is shape-selective molecular sieve based catalysts zeolite socony mobile-5 (ZSM-5), Na-ZSM-5, hydrogen zeolite socony mobile-5 (HZSM-5) or an aluminum phosphate molecular sieve, the feed rate is controlled at 3 to 6 m<3>/h according to the size of equipment, and the biological oil is catalyzed and subjected to the thermal cracking under the condition that the using amount of the catalyst is 2 percent of the mass of the biological oil. In the biomass thermal cracking liquefying fuel oil technology, the ash content is removed, and the influence of the ash content is reduced in the thermal cracking process, so that the yield of the biological oil is improved by 50 to 60 percent. In addition, the biological oil is refined by a catalytic cracking method after cracking reaction, and oxygen in the biological oil is removed in form of CO, CO and HO by the catalyst at intermediate temperature under normal pressure in a thermochemical method; and thus, the biological oil is converted into liquid fuel which is stable, high in oil quality and high in energy density and can be applied widely and directly at normal temperature.

Description

technical field [0001] The invention relates to a method for preparing bio-oil from biomass. Background technique [0002] Biomass pyrolysis technology is one of the cutting-edge technologies of biomass energy research in the world. [0003] Depending on the reaction temperature and heating rate, biomass pyrolysis processes can be classified as slow, conventional, fast or flash intensive. Low-temperature slow pyrolysis (<500°C), the product is mainly charcoal; high-temperature flash pyrolysis (700-1100°C), the product is mainly combustible gas; medium-temperature rapid pyrolysis (500-650°C), the product is bio Oil-based. [0004] Biomass pyrolysis liquefaction is to directly pyrolyze biomass under the conditions of medium temperature (500-650°C), high heating rate (104-105°C / s) and extremely short gas residence time (<2s). Cooling allows intermediate liquid product molecules to condense before further fragmentation to gas, resulting in high yields of biomass liquid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00C10B53/02C10B57/00C10B57/08C10B57/10
CPCY02E50/14Y02E50/10
Inventor 郑德华
Owner 青岛福瑞斯生物能源科技开发有限公司
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