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Preparation method of water hyacinth biochar

A water hyacinth, biochar technology, applied in the fields of biofuels, separation methods, chemical instruments and methods, etc.

Active Publication Date: 2014-07-23
广东华工碧水环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no reports on the use of water hyacinth as raw material to produce high-quality biochar.

Method used

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  • Preparation method of water hyacinth biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Cut off the roots and leaves of the water hyacinth, and only take the expanded part of the petiole (the bulb); clean the surface impurities with clean water (tap water); chop the bulb of the water hyacinth to a degree of 0.6cm. Dry it naturally for 8 days in a well-lit place until the moisture content reaches 12.1%. After preliminary dehydration, the raw materials are placed in a freeze dryer for 6 hours; until the moisture content is 1.5%. Put the freeze-dried raw material into the tube furnace, and pass it into the furnace for 25 minutes before heating with a gas velocity of 300cm 3 / min of nitrogen to exhaust the air in the furnace. Set the reaction temperature to 600°C, and reach the target temperature in 15 minutes; keep the constant temperature for 60 minutes (adjust the temperature control element to make the temperature ±1°C). After the constant temperature pyrolysis is completed, turn off the power, keep the closed state of the reaction furnace, isolate the a...

Embodiment 2

[0027] Cut off the roots and leaves of the water hyacinth, take the stem (the whole stem), rinse with water; chop to 1cm, and let it dry naturally in the sun for 6 days until the water content reaches 14.8%. Put the raw material after preliminary dehydration into the tube furnace, and pass it into the furnace for 20 minutes before heating with a gas velocity of 250cm 3 / min of nitrogen, so that the reaction furnace is an oxygen-free environment. Set the reaction temperature to 450°C, rapidly increase the temperature (8 minutes to reach the target temperature), and then set the constant temperature reaction time to 40 minutes. After the constant temperature pyrolysis is completed, turn off the power, keep the reaction furnace closed, and cool down naturally to obtain water hyacinth biochar. (Remove after cooling to room temperature). The product number is BCL450.

[0028] Compared with BCH600, BCL450 has a lower cost and can be used as a soil improver; it can also be used as ...

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Abstract

The invention discloses a method for preparing biochar from water hyacinth. The method is mainly characterized by comprising the steps of cleaning expanded parts of leaf stalks of water hyacinth as raw materials, cutting, primarily dewatering, fully dewatering in a freeze-drying machine, quickly heating the freeze-dried raw materials in a tubular furnace in the absence of oxygen (pre-filling nitrogen to remove air from the furnace), and after the raw materials reach the set temperature and the temperature is kept for a certain time, obtaining the water hyacinth biochar. The biochar prepared by adopting the method has a good structure and stable performance, serves as high-quality active carbon and is wide in application range. A new way is opened up for water hyacinth recycling, and the headache for the problem of ecological invasion of the water hyacinth is conveniently solved.

Description

technical field [0001] The invention relates to a preparation method of biochar, in particular to a preparation method of water hyacinth biochar. Background technique [0002] Water hyacinth (water hyacinth) is a perennial floating herb. Water hyacinth has strong fertility and disease resistance, and is one of the fastest growing and reproducing aquatic plants in the world. Water hyacinth is an invasive alien species. After the reform and opening up, my country's economy has developed rapidly, and the problem of eutrophication in water bodies has become prominent, which has caused water hyacinth to grow wildly and brought serious ecological and environmental problems. The management of water hyacinth is a difficult task. In addition to the high cost of salvage, how to deal with the huge amount of water hyacinth is a very difficult problem. Generally, direct landfill is used, but this requires a large amount of land and the water hyacinth will still emit a foul smell after...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08B01J20/20B01J20/30C10B53/02C10B57/10C02F1/28B01D53/02C05G3/00C05G3/08C01B32/324C05G3/90
CPCY02E50/10Y02W10/37Y02P60/21Y02A40/22
Inventor 利锋梁燕燕
Owner 广东华工碧水环境技术有限公司
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