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Method for preparing biomass gas from plant branches and trunks

A biomass gas and branch technology, which is applied in the preparation of combustible gas and liquid hydrocarbon mixture, chemical instruments and methods, etc., can solve the problem of reducing biomass gas conversion rate, low gas combustion calorific value, and low gas combustion calorific value. and other problems, to achieve the effect of shortening the liquefaction processing time, increasing the combustion calorific value, and small equipment investment

Inactive Publication Date: 2012-03-21
INNER MONGOLIA JINDI BIOMASS
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Problems solved by technology

The disadvantages of the technology are low biological conversion rate, complex gas purification, high production cost, low calorific value of the product, and not clean enough.
The biogas fermentation method has been popularized and applied in China, but this method takes a long time to ferment, lowers the conversion rate of biomass, and has a low calorific value of gas combustion, so it can only be produced on a small scale.
[0005] There are many studies on the preparation of biomass gas or biomass gas by using biomass, for example: the invention patent application with application number 200610017164.0 discloses a process and device for preparing gas by continuous dry distillation of biomass, including the preparation and feeding of raw materials, raw materials Gasification, gas purification and transportation, carbon removal recovery process; also includes the devices required to complete the process: raw material processing and feeding system, dry distillation furnace gas generation system, gas purification and transportation storage system, carbon removal recovery system, the invention The preparation of gas is mainly carried out by continuous dry distillation, the conversion rate of biomass is low, and the calorific value of gas combustion is low; another example is the invention patent application with application number 200710037007.0, which discloses a method and device for gasification of biomass as raw material. , the method includes the following steps: (1) coarsely crushing the biomass raw material, sending it into a low-temperature pyrolysis furnace, and pyrolyzing the biomass under the conditions of 300-500° C. and a pressure of 0.3-3.5 MPa to generate the main pyrolysis product biomass semi-coke, and then grind to a particle size of 1000°C), biomass is easy to carbonize at high temperature, and there are many waste residues, which reduces the conversion of biomass gas Rate

Method used

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  • Method for preparing biomass gas from plant branches and trunks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Raw material preparation

[0039]Crush the corn stalks into straw fragments with a length ≤ 20mm, and set aside.

[0040] 2. Hydrothermal liquefaction treatment

[0041] 1) Mix corn stalk fragments with the first catalyst, then add water and stir evenly to obtain a mixed material, wherein the first catalyst is a mixture of sodium carbonate and lanthanum oxide, and the weight ratio of sodium carbonate and lanthanum oxide is 92:8 The weight ratio of corn stalk fragments (dry weight) to the first catalyst is 100:1.5; the weight ratio of corn stalk fragment weight (dry weight) to the weight of water in the mixed material is 40:60;

[0042] 2) Send the mixed material into a vertical refiner (Shandong Zhucheng Beitel Paper Equipment Co., Ltd.) to make pulpy corn stalk slurry, wherein the particle size of the prepared corn stalk slurry is ≤3mm;

[0043] 3) The straw slurry is pumped by a high-pressure plunger to a shell-and-tube preheater (Sinopec Puyang Zhongshi Group Gr...

Embodiment 2

[0063] In addition to using Salix salix as raw material;

[0064] In the process of hydrothermal liquefaction, except that in step 1), the weight ratio of salix fragments (dry weight) and the first catalyst is 100:2, and the weight ratio of sodium carbonate and lanthanum oxide in the first catalyst is 90:10 The ratio of the weight (dry weight) of Salix salix fragments to the weight of water in the mixed material is 30:70; the temperature of the preheated slurry in step 3) is 220°C; the temperature of hydrothermal liquefaction treatment in step 4) is 280°C; ℃, the absolute pressure is 9MPa, and the treatment time is 20min; the relative pressure of the liquefied mixture sent into the high-pressure buffer vessel in step 5) is reduced to 0.1MPa and sent outside the flash tank, and the rest are the same as in Example 1;

[0065] In the cracking and gasification process, except that the heating temperature in step 1) reaches 320°C, the weight ratio of sodium carbonate, lanthanum oxi...

Embodiment 3

[0068] In addition to using soybean straw as raw material;

[0069] In the hydrothermal liquefaction process, except that the weight ratio of soybean straw (dry weight) and the first catalyst in step 1) is 100:1, the weight ratio of sodium carbonate and lanthanum oxide in the first catalyst is 91:9; The ratio of the straw weight (dry weight) to the weight of water in the mixed material is 35:65; the temperature of the preheated slurry in step 3) is 230°C; the temperature of the hydrothermal liquefaction treatment in step 4) is 270°C, and the absolute pressure It is 10MPa, and the treatment time is 15min; the relative pressure of the liquefied mixture sent in the high-pressure buffer vessel in step 5) is reduced to 0.3MPa and then sent outside the flash tank, and all the other are the same as in Example 1;

[0070] In the cracking and gasification process, except that the heating temperature in step 1) reaches 330° C., the weight ratio of sodium carbonate, lanthanum oxide, and ...

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Abstract

The invention discloses a method for preparing biomass gas by using plant branch and trunk type biomasses as raw materials, which comprises the following steps of: 1) carrying out hydro-thermal liquefaction treatment on plant branches and trunks, water and first catalysts for preparing first non-condensable gas and first liquid mixtures; 2) carrying out cracking and gasification treatment on the first liquid mixtures and second catalysts to obtain second non-condensable gas; and 3) obtaining the biomass gas through the purification and the impurity removal of the first non-condensable gas and the second non-condensable gas. The method is used for preparing the clean and environmental biomass gas with high fuel thermal value by using agricultural / forest wastes as the raw materials, the product yield is high, and the biomass gas prepared by the invention is used as gas, has the same equivalent efficiency as coal gas and natural gas and belongs to the development direction of biological energy source industry.

Description

technical field [0001] The invention relates to a method for preparing new energy biomass gas, in particular to a method for preparing biomass gas by using agricultural and forestry waste biomass as a basic raw material. technical background [0002] Agricultural and forestry waste is a kind of renewable energy material with large yield, which has not been rationally utilized for a long time. With the depletion of energy substances such as oil and coal, biomass energy becomes more and more important. Biomass gasification technology is an important technology that can efficiently convert biomass energy materials into clean fuels. Using this technology can not only save energy materials such as oil and coal, but also make full use of agricultural and forestry solid waste and reduce environmental pollution. . Biomass gasification technology is a renewable energy technology that should be vigorously developed. [0003] Biomass gas is a kind of biomass gas that uses catalytic ...

Claims

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Application Information

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IPC IPC(8): C10J3/00C10G1/08C01B3/38
CPCY02P20/52
Inventor 颉二旺
Owner INNER MONGOLIA JINDI BIOMASS
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