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Utilization method for CO2 in biomass pyrolysis tail gas

A biomass pyrolysis and biomass technology, which is applied in the fields of biofuels, carbon monoxide, special forms of dry distillation, etc., can solve problems such as applications that do not involve the improvement of reaction performance, reduce investment in storage and treatment, improve economy and environmental protection, Emission reduction effect

Pending Publication Date: 2019-05-28
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] Published patents and literature mention that carbonaceous resources can be used to reduce carbon dioxide to carbon monoxide, but none of them involve the improvement of the reaction performance of the process and the application of this technology in the field of biomass pyrolysis
So far, there is no research on the use of by-product biochar produced by biomass pyrolysis to reduce CO 2 However, there is no report on the use of biochar produced by the biomass pyrolysis system itself to reduce CO in the pyrolysis gas under the action of autocatalysis or an external catalyst. 2 Reports on the preparation of CO

Method used

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  • Utilization method for CO2 in biomass pyrolysis tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 5g of biochar produced by the rapid pyrolysis of corncobs and fill it into the middle of the fixed-bed reactor, and feed it with N 2 Purge at room temperature for 10 minutes to remove the air in the system, and then raise the temperature to 900°C. After the reactor bed reached the target reaction temperature, the N 2 Switch to 95% CO 2 -5%N 2 Mixed gas, gas chromatographic detection of tail gas changes. The test results are shown in Table 1.

Embodiment 2

[0023] Weigh 5g of biochar produced by rapid pyrolysis of rice husk and fill it into the middle of the fixed-bed reactor, and feed N 2 Purge at room temperature for 10 minutes to remove the air in the system, and then raise the temperature to 1200°C. After the reactor bed reached the target reaction temperature, the N 2 Switch to 95% CO 2 -5%N 2 Mixed gas, gas chromatographic detection of tail gas changes. The test results are shown in Table 1.

Embodiment 3

[0025] Weigh 5g of biochar produced by the rapid pyrolysis of rice straw and fill it into the middle of the fixed-bed reactor. 2 Purge at room temperature for 10 minutes to remove the air in the system, and then raise the temperature to 700°C. After the reactor bed reached the target reaction temperature, the N 2 Switch to 95% CO 2 -5%N 2 Mixed gas, gas chromatographic detection of tail gas changes. The test results are shown in Table 1.

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Abstract

The invention provides a utilization method for CO2 in biomass pyrolysis tail gas. The method comprises the following steps that biological carbon produced in the biomass pyrolysis process is adoptedas a reducing agent, the CO2 with relatively high content in pyrolysis tail gas is reduced to CO through catalytic reaction, and preferably, an alkaline metal catalyst can be added in a reaction system to accelerate a reduction speed of the CO2, wherein the alkaline metal catalyst is one or more of alkali metal, alkaline earth metal or rare earth metal. By adopting the method provided by the invention, the greenhouse gas CO2 produced by biomass pyrolysis can be converted to high-added-value CO, and the biological carbon produced in the pyrolysis process is converted to the CO at the same time,so that the utilization rate of carbon resources in the biomass pyrolysis process is increased, emission of the greenhouse gas is reduced, and the utilization method has a good industrial applicationprospect.

Description

technical field [0001] The present invention relates to CO 2 conversion and utilization, especially involving a kind of CO in the tail gas of biomass pyrolysis 2 method of use. Background technique [0002] With the intensification of the consumption of traditional fossil resources such as petroleum and the increasingly stringent requirements for environmental protection, the research on renewable energy has attracted extensive attention. Lignocellulosic biomass is the most abundant renewable resource on earth, and its efficient conversion into energy, materials and high value-added chemicals is currently the most effective way to alleviate the energy crisis and environmental pressure. Among them, biomass pyrolysis is considered to be one of the most effective ways in biomass conversion technology, and has attracted extensive attention from academia and industry. [0003] Biomass pyrolysis refers to the process of pyrolyzing biomass raw materials in the absence of air or ...

Claims

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Application Information

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IPC IPC(8): C01B32/40C10B53/02
CPCY02E50/10
Inventor 张宗超杜虹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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