A device and method for catalytic rapid pyrolysis of biomass based on hydrogen overflow

A biomass and overflow technology, applied in the preparation of liquid hydrocarbon mixtures, the treatment of hydrocarbon oil, the petroleum industry, etc., can solve the problems of no direct recycling, low hydrocarbon content, high oxygen content, etc., and achieve high value The effect of improving the utilization of hydrocarbons, increasing the content of hydrocarbons, and improving process efficiency

Active Publication Date: 2022-03-11
SOUTHEAST UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0007] (1) ZSM-5 molecular sieves will inevitably have coking problems in the catalytic rapid pyrolysis of biomass, and the coking problems are closely related to the reaction atmosphere. Improper selection of reaction atmospheres will lead to an increase in the coking amount of the catalyst, a decrease in activity, and a greatly shortened catalyst. service life, but also lead to a reduction in carbon utilization
[0008] (2) Although the quality of bio-oil obtained by catalytic rapid pyrolysis of biomass has been greatly improved, compared with fossil fuels, there is still a big gap, and the problems of high oxygen content and low hydrocarbon content still remain Significantly, making it difficult to effectively use
[0009] (3) Nowadays, the non-condensable gas rich in hydrogen and methane in the pyrolysis gas is usually collected and used separately, but the rich hydrogen content in it is conducive to improving the catalytic upgrading of biomass pyrolysis gas to improve the quality of bio-oil. direct recycling

Method used

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  • A device and method for catalytic rapid pyrolysis of biomass based on hydrogen overflow

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Experimental program
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Effect test

specific Embodiment 1

[0057] Include the following steps:

[0058] Step 1: Fill 50g of alumina particles 4 in the bubbling fluidized bed reactor, fill the feeder 7 with biomass raw material 8, Pt / TiO 2 The mixing ratio with ZSM-5 molecular sieve is 1:3, according to figure 1 The connection relationship shown connects the fast pyrolysis device;

[0059] Step 2: Open the valve of the hydrogen cylinder 1, adjust the hydrogen flow rate so that it flows through the carrier gas preheater 2 to preheat the hydrogen temperature to 275°C, and ensure that the alumina particles 4 in the bubbling fluidized bed reactor can be normal Fluidization, exhaust the air in the device;

[0060] Step 3: Send 10g of biomass raw material 8 into the bubbling fluidized bed reactor by using the feeder 7 to ensure that the composite catalyst 13 is 1 / 3 of the quality of the biomass raw material 8; start the pyrolysis reaction to generate pyrolysis gas, The pyrolysis temperature is 400°C, and the pyrolysis gas passes through t...

specific Embodiment 2

[0063] Include the following steps:

[0064] Step 1: Fill 50g of alumina particles 4 in the bubbling fluidized bed reactor, fill the feeder 7 with biomass raw material 8, Pt / TiO 2 The mixing ratio with ZSM-5 molecular sieve is 1:3, according to figure 1 The connection relationship shown connects the fast pyrolysis device;

[0065] Step 2: Open the hydrogen gas source 1 valve, adjust the hydrogen flow rate so that it flows through the carrier gas preheater 2 to preheat the hydrogen temperature to 275°C, and ensure that the alumina particles 4 in the bubbling fluidized bed reactor can be normal Fluidization, exhaust the air in the device;

[0066] Step 3: Send 10g of biomass raw material 8 into the bubbling fluidized bed reactor by using the feeder 7 to ensure that the composite catalyst 13 is 1 / 3 of the quality of the biomass raw material 8; start the pyrolysis reaction to generate pyrolysis gas, The pyrolysis temperature is 300°C, and the pyrolysis gas passes through the as...

specific Embodiment 3

[0069] Include the following steps:

[0070] Step 1: Fill 50g of alumina particles 4 in the bubbling fluidized bed reactor, fill the feeder 7 with biomass raw material 8, Pt / TiO 2 The mixing ratio with ZSM-5 molecular sieve is 3:1, according to figure 1 The connection relationship shown connects the fast pyrolysis device;

[0071] Step 2: Open the hydrogen gas source 1 valve, adjust the hydrogen flow rate so that it flows through the carrier gas preheater 2 to preheat the hydrogen temperature to 275°C, and ensure that the alumina particles 4 in the bubbling fluidized bed reactor can be normal Fluidization, exhaust the air in the device;

[0072] Step 3: Use the feeder 7 to send 10g of the biomass raw material 8 into the bubbling fluidized bed reactor to ensure that the composite catalyst 13 is three times the quality of the biomass raw material 8; start the pyrolysis reaction, generate pyrolysis gas, and heat The pyrolysis temperature is 400°C, the pyrolysis gas passes thro...

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Abstract

The invention relates to a hydrogen overflow catalytic rapid pyrolysis device and method for biomass in the presence of hydrogen. Hydrogen is used as a carrier gas, and a bubbling fluidized bed is used as a pyrolysis reactor for biomass. Aluminum oxide particles are placed in a flow In the bed, to enhance the fluidization characteristics of biomass particles. Pyrolysis gas flow through an ex situ catalytic reactor using Pt / TiO 2 The mixture with ZSM-5 molecular sieve is used as a composite catalyst, and the hydrogen overflow phenomenon on the catalyst is used to replenish ZSM-5, which strengthens the catalytic upgrading of pyrolysis gas in the catalyst, reduces the oxygen content in bio-oil, and improves Hydrocarbon content in bio-oil. At the same time, hydrogen is used as a carrier gas to reduce the coking amount of the catalyst. The invention prolongs the service life of the catalyst and realizes the transformation of biomass into high-quality bio-oil by adopting the non-situ catalytic upgrading method based on hydrogen overflow.

Description

technical field [0001] The invention relates to the technical field of biomass catalytic pyrolysis oil production in the fields of chemical industry and energy utilization, in particular to a hydrogen overflow-based biomass catalytic fast pyrolysis device and method. Background technique [0002] Biomass energy, as a renewable energy source, has been extensively studied by thermochemical methods to convert it into usable bio-oil and syngas. Among them, pyrolysis technology has shown good results in converting biomass into bio-oil. The bio-oil obtained by direct pyrolysis of biomass has the characteristics of "more oxygen and hydrogen deficiency", which leads to the initial pyrolysis bio-oil with low calorific value (16-19MJ / kg), high water content, high viscosity, and corrosiveness. The disadvantages of large and low stability limit the possibility of directly using it as a substitute for or blending with fossil fuels. Therefore, research on catalytic upgrading during bioma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/08C10G1/06C10G1/00
CPCC10G1/08C10G1/086C10G1/06C10G1/002C10G2300/1011
Inventor 张波何腾飞仲思颖刘辰昊
Owner SOUTHEAST UNIV
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