Method for preparing hydrogen-rich synthesis gas via biomass pyrolysis

A biomass and synthesis gas technology, which is applied in the preparation of liquid hydrocarbon mixtures, biofuels, chemical instruments and methods, etc., can solve the problems of low yield of reforming hydrogen production and serious coking, and achieves reduction of gasification coking, The effect of saving energy and reducing energy consumption

Inactive Publication Date: 2013-03-13
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to avoid the shortcomings of the prior art, the present invention provides a method for preparing high-quality synthesis gas by two-stage conversion of biomass, so as to overcome the problems of low hydrogen production rate and serious coking of existing biomass pyrolysis oil reforming

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  • Method for preparing hydrogen-rich synthesis gas via biomass pyrolysis

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Embodiment 1

[0029] Use rice husk as raw material, crush it to a particle size of less than 1mm, and soak it with a modified attapulgite catalyst containing 10% nickel in an aqueous solution for 0.5-2 hours, and the catalyst dosage is 9-11% of the mass of biomass scrap %. After fully stirring, dry it in the air, and then dry it in an oven at 75-105°C for 1.5-3 hours to remove free water. Cracking is then carried out in a fluidized bed device, and then catalytic reforming is carried out through a microwave-enhanced catalytic bed, and 200 g of nickel-molybdenum modified attapulgite catalyst is placed in a microwave catalytic bed to carry out catalytic reforming of bio-oil vapor, catalytic reforming The whole time is 10 minutes, and the cracking conditions are: the fluidized bed cracking temperature is 500°C, the air pressure is 0.01Mpa, the second-stage microwave cracking temperature is 750°C, the mass ratio of biomass to water vapor is 1:1, the air pressure is normal pressure, microwave Th...

Embodiment 2

[0031] Using pine wood as raw material, using the same steps as in Example 1, the catalyst is the same, the difference is that in the cracking step, the cracking conditions are that the fluidized bed cracking temperature is 500 ° C, the air pressure is 0.08Mpa, and the mass ratio of biomass to water vapor is 1 :1, the microwave cracking temperature is 800°C, the air pressure is normal pressure, and the microwave frequency is 2500MHz. Liquid product was collected. The yield of the gas product is 61.6%, and the gas product contains H 2 65.8%, CO 19.75%, CH 4 1.84%, CO 2 12.61%.

Embodiment 3

[0033]Using cotton stalks as raw material, adopt the same steps as in Example 1, the catalyst is the same, the difference is that in the cracking step, the cracking conditions are: the fluidized bed cracking temperature is 450°C, the air pressure is 0.05Mpa, the mass ratio of biomass to water vapor 1:1, the microwave cracking temperature is 800°C, the air pressure is normal pressure, and the microwave frequency is 2450MHz, and the liquid product is collected. The yield of the gas product is 68.4%, and the gas product contains H 2 67.8%, CO 13.75%, CH 4 2.24%, CO 2 16.21%.

[0034] The catalysts used in this example can be commercially available products or self-prepared according to conventional methods, wherein the main components of the modified attapulgite catalyst are NiO and attapulgite, and the Ni content is about 10%; nickel-molybdenum modified attapulgite The main components of the catalyst are NiO, MoO and attapulgite. NiO accounts for 14wt%, MoO accounts for 12...

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Abstract

The invention discloses a method for preparing a hydrogen-rich synthesis gas via biomass pyrolysis, comprising the following steps of: by taking biomass particles having a particle size of not greater than 2 mm as raw materials, conveying the biomass particles in a fluidized bed reactor in which the N2 flow of a fluidized bed is 1.0-1.5m<3> / h and the pressure is 0.01-0.08 MPa via a spiral feeder at a speed of 0.005-0.01 t / h; performing pyrolysis at the temperature of 450-550 DEG C; performing catalytic reforming on the surface of a catalyst by the highly-hot vapour generated by the pyrolysis reaction through a microwave catalytic bed; and further transforming biological oil vapour to the synthesis gas, and charging a small amount of oxygen in the microwave catalytic bed to inhibit coking on the surface of the catalyst. According to the invention, energy consumption is reduced, and the transformation rates of hydrogen and biomass are increased by performing a catalytic reforming reaction on a microwave stationary bed via the biological oil vapour after the first-stage fluidized bed pyrolysis.

Description

technical field [0001] The invention relates to a method for producing hydrogen from biomass, that is, a method for preparing high-quality synthesis gas by using a fluidized bed-microwave catalytic reforming bed two-stage cracking conversion device. Background technique [0002] At present, energy and environmental issues have become the focus of global attention, and fossil fuel resources still play the role of the world's energy pillar and the source of bulk organic chemical products. Energy issues have gradually become the main obstacle restricting the sustainable development of my country's economy. As the only renewable resource that can be stored and transported, biomass energy occupies a very important position in my country's energy structure. Biomass can achieve CO 2 Zero emission fundamentally solves the problem of greenhouse effect caused by energy consumption. Biomass gasification technology is an important aspect of the application of biomass energy. It can co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/22C01B3/32C10G1/00C10B53/02
CPCY02E50/14Y02E50/10
Inventor 刘少敏陈明强方文惠杨忠连王君陈明功孔黎红李峰汪涓
Owner ANHUI UNIV OF SCI & TECH
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