Preparation method of high-yield biochar

A biochar, high-yield technology, used in biofuels, educts, special forms of dry distillation, etc., can solve the problems of high temperature of 105 ° C and long immersion time, and achieve high yield, wide application range, and reduced volatility. The effect of the generation of matter

Active Publication Date: 2015-02-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN103213985A mentions a method of preparing biochar by zinc borate flame retardant method, and mentions that the yield of biochar is improved, but the first step of soaking time is long and the temperature is too high at 105°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put the collected rice stalks into an aqueous solution containing 0.5% by weight of boric acid, the weight of the rice stalks is 5% of the weight of the whole system, stir and soak at room temperature for 1 hour, and filter out the liquid with a filter screen to obtain 0.5wt% boric acid, water by weight 50% rice straw, the rice straw on the filter screen was transferred to the pyrolysis furnace, under the protective atmosphere of high-purity nitrogen, the heating rate was raised to 100°C at a rate of 0.5°C / min, kept for 1 hour, and then Raise the temperature at a rate of 0.5 °C / min to 240 °C, keep the temperature for 1 hour, and finally raise the temperature at a rate of 10 °C / min to 500 °C, keep the temperature for 1 hour, and cool with the furnace to obtain biochar with a yield of 55 wt%.

Embodiment 2

[0025] Put the collected rice husks into an aqueous solution containing 10% by weight of potassium permanganate, the weight of the rice husks is 20% of the weight of the whole system, stir and soak at room temperature for 5 hours, and filter out the liquid with a filter screen to obtain potassium permanganate-containing 5wt% rice husk with a weight moisture content of 150%, the rice husk on the filter screen is transferred to the pyrolysis furnace, under the protective atmosphere of high-purity argon, the temperature rises to 180°C at a rate of 2°C / min, and the temperature is kept for 2 hours, then raised to 300°C at a heating rate of 3°C / min, kept for 3 hours, and finally raised to 900°C at a heating rate of 50°C / min, kept at a temperature of 4 hours, and then cooled with the furnace to obtain biochar, with a yield of 40.1 wt%.

Embodiment 3

[0027] Put the collected bamboo into a solution containing 5% by weight of γ-aminopropyltriethoxysilane, the weight of the bamboo is 10% of the weight of the whole system, stir and soak at room temperature for 5 hours, and filter the liquid with a filter screen to obtain γ-aminopropyltriethoxysilane 1wt%, the bamboo material of weight moisture content 80%, the bamboo material on the filter screen is transferred in the pyrolysis furnace, under the atmosphere that nitrogen and water vapor volume ratio are 90:10, with 2 The heating rate of ℃ / min was raised to 180°C, kept for 2 hours, then raised to 300°C at a rate of 3°C / min, kept for 3 hours, and finally raised to 900°C at a rate of 50°C / min, kept for 4 hours Hours, the biochar is obtained with furnace cooling, and the yield is 49wt%.

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Abstract

The invention discloses a preparation method of high-yield biochar, which mainly comprises the following steps: (1) putting a collected biomass raw material into a catalyst solution, stirring and impregnating at normal temperature, and filtering to obtain the biomass raw material containing moisture and catalyst, the moisture weight percentage is 50-150%, and the catalyst weight content is 0.5-5%; and (2) heating the biomass raw material containing moisture and catalyst in an oxygen-free or limited-oxygen atmosphere to 100-180 DEG C at the rate of 0.5-2 DEG C/minute, keeping the temperature for 1-2 hours, heating to 240-300 DEG C at the rate of 0.5-3 DEG C/minute, keeping the temperature for 1-3 hours, heating to 500-900 DEG C at the rate of 10-50 DEG C/minute, keeping the temperature for 1-4 hours, and cooling to obtain the biochar, wherein the yield of the biochar is greater than 40 wt% of the biomass raw material. The method does not need drying in the biochar preparation process; the biomass raw material containing moisture and catalyst and the multi-step carbonization technique are utilized to achieve the goal of enhancing the biochar yield; and the biochar has the characteristics of energy saving, large specific area and high porosity, and can be widely used in the fields of water treatment, functional textiles and the like.

Description

technical field [0001] The invention belongs to the technical field of biochar preparation, and relates to a method for preparing biochar with high yield. In particular, it relates to a method for preparing high-yield biochar from agricultural and forestry wastes. Background technique [0002] The waste generated in the process of agricultural and forestry processing in the world is a huge number. In my country alone, the output of rice husk in 2011 reached about 40 million tons, and the output of various crop straws exceeded 700 million tons per year. The disposal of these crop stalks, rice husks, etc. is a problem. Pyrolysis is to convert biomass raw materials into other products for utilization by thermal decomposition. It is relatively simple to implement, has a high energy conversion rate, and is also conducive to large-scale processing of biomass raw materials. It is one of the effective methods to solve the above-mentioned agricultural and forestry waste biomass raw ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02C10B57/08
CPCC10B53/02C10B57/08Y02E50/10Y02P20/145
Inventor 程旭王彪朱方亮王华平
Owner DONGHUA UNIV
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