Method for preparing methane-rich gas through autocatalytic gasification of biomass

A catalytic gasification and biomass technology, which is applied in the manufacture of combustible gas, gas fuel, biofuel, etc., can solve the problems that are not involved, and achieve the effect of increasing the content of methane, promoting the generation, and reducing the generation of tar.

Active Publication Date: 2012-11-21
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

[0008] None of the above patents involves the use of alkali / alkaline earth metals contained in biomass to catalyze pyrolysis, catalytic gasification, and crude synthesis gas generated by gasification to separate hydrogen-rich gas and return it to the gasification reactor, so that pyrolysis of solids occurs simultaneously. Method for preparing methane-enriched gas by hydrogenation gasification

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  • Method for preparing methane-rich gas through autocatalytic gasification of biomass

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Embodiment 1

[0036] In this example, a method for producing methane-rich gas by self-catalytic gasification of biomass is used. The technical flow diagram is shown in figure 1 , the process includes the following steps:

[0037] (1) The pine wood powder with an ash content of 1.6% was sprayed and soaked with the quenching liquid of gasification bottom ash and burning ash, and then placed outdoors to dry naturally.

[0038] (2) The air-dried biomass is added to the spiral pyrolysis device for catalytic pyrolysis at 320°C, using flue gas for indirect heating, and the outlet flue gas preheats the air and then is emptied after being treated by the flue gas purification system;

[0039] (3) Send the pyrolysis coke produced by the biomass in the spiral pyrolysis reactor in step (2) into the fluidized bed gasification reactor for pressurized steam / oxygen catalytic gasification, the reaction temperature is about 790°C, The gasification bottom ash is discharged into the ash hopper, the outlet gas ...

Embodiment 2

[0050] The wheat straw powder with an ash content of 10.10% was sprayed and soaked with the quenching solution of gasification bottom ash and combustion ash, the mass ratio of biomass and quenching solution was controlled at 1:0.8, and the potassium, sodium, The total content of calcium and magnesium elements is 3.5%. Then dry to a moisture content of 5.2%. The wheat straw powder is pyrolyzed in a spiral pyrolysis device, using flue gas at 410°C as indirect heat supply, the pyrolysis time is 15 minutes, the average temperature in the spiral reactor is about 290°C, and the quality of the solid product produced is 65.7%. Gas accounts for 34.3% of biomass mass. Straw coke is gasified with water vapor in the gasification reactor, the inlet temperature of water vapor is 280°C, the ratio of pyrolysis coke to water vapor is 0.8, the excess oxygen coefficient is 0.35, the reaction temperature is 725°C, and the reaction pressure is 1.2 MPa, H in the gas returned from the gas separati...

Embodiment 3

[0052] The rice straw powder with an ash content of 16.32% was sprayed and soaked with the quenching liquid of gasification bottom ash and combustion ash, the mass ratio of biomass and quenching liquid was controlled at 1:0.5, and then dried to a moisture content of 10.7 %, the total content of potassium, sodium, calcium and magnesium elements is 4.8%. The rice straw is pyrolyzed in a spiral pyrolysis device, using flue gas at 430°C as indirect heat supply, the pyrolysis time is 10 minutes, the average temperature in the spiral reactor is about 300°C, and the quality of the solid product produced is 69.2%. It accounts for 30.8% of biomass mass. Rice straw pyrolysis coke is gasified with water vapor / oxygen under pressure in the gasification reactor, the inlet temperature of water vapor is 300°C, the mass ratio of rice straw pyrolysis coke to water vapor is 0.5, and the oxygen excess coefficient is 0.2. The temperature is 760°C, the reaction pressure is 3MPa, the H in the gas i...

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Abstract

The invention aims to provide a method for preparing methane-rich gas through cyclic utilization of alkali/alkaline earth metals contained in biomass for autocatalytic pyrolysis and autocatalytic pressurized gasification of the biomass. According to the method, water quenching is carried out on biomass ash so as to cyclically extract alkali/alkaline earth metals in the biomass ash, and the alkali/alkaline earth metals are sprinkled on and dipped in biomass; the biomass containing the alkali/alkaline earth metals undergoes autocatalytic pyrolysis at a low temperature of 280 to 320 DEG C at first, then a pyrolysis gas product enters into a combustion reactor and burns together with solid particles separated from a gasification reactor so as to supply heat for the process of pyrolysis, a pyrolysis solid product enters into the gasification reactor and undergoes autocatalytic pressurized gasification in a steam/oxygen atmosphere, hydrogen-rich gas is separated from crude synthetic gas produced in gasification and is returned to the pressurized gasification reactor, and the pyrolysis solid product is subjected to hydrogasification at the same time. With the method provide by the invention, biomass can be used for preparing methane-rich gas with low tar content, and high gasification efficiency is obtained. The method has the advantages of simple operation, less water consumption, strong technological adaptability and easy operation.

Description

technical field [0001] The invention relates to the technical field of biomass energy conversion application, in particular to a method for producing methane-enriched gas through self-catalyzed pyrolysis and self-catalyzed pressurized gasification by recycling alkali / alkaline earth metal contained in biomass. technical background [0002] my country has huge reserves of agricultural and forestry biomass resources, and the use of biomass gasification synthetic fuels to replace increasingly depleted fossil fuels has broad market prospects. The utilization of biomass energy is mainly divided into direct utilization and indirect (conversion) utilization, and the conversion and utilization of biomass energy mainly includes thermochemical conversion and biochemical conversion and utilization. Generally speaking, the thermochemical conversion process takes a short time and has high efficiency, mainly including direct combustion, pyrolysis and gasification. Biomass gasification is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C10L3/10C10J3/00C10B53/02C10B57/10
CPCY02E50/14Y02E50/10
Inventor 赵增立武宏香李海滨王小波何方
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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