Dry distillation charring method for bamboos

A bamboo and carbonization technology, applied in chemical instruments and methods, special forms of dry distillation, direct heating dry distillation, etc., can solve the problems of poor quality stability, high density of bamboo charcoal, high refining temperature, etc., and achieve strong electromagnetic wave shielding ability and high antistatic ability , the effect of high calcination temperature

Inactive Publication Date: 2012-08-22
ZHEJIANG JIANZHONG BAMBOO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The earthen kiln is cheap, the refining temperature is high, and the density of bamboo charcoal is high, but the quality stability is poor and the yield is not high
[0012] Chinese patent CN200410008345.8 discloses "a production method of bamboo charcoal", which takes a long time to prepare, and does not consider the collection of bamboo vinegar, and the production is not economical and environmentally friendly.
Chinese patent CN03122806.2 discloses a "method for continuous dry distillation and carbonization of wood and bamboo". The prepared bamboo charcoal contains dust impurities, has a dull surface, low adsorption performance, weak antistatic ability and electromagnetic wave shielding performance, and needs further improvement.

Method used

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  • Dry distillation charring method for bamboos
  • Dry distillation charring method for bamboos

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The pilot test was carried out in a vertical moving bed dry distillation carbonization furnace. Bamboo chips (about 36cm in length) with an average moisture content of 39% were used to measure the temperature of each temperature point. The drying zone A was 150°C, and the pre-carbonization zone B was 275°C. Carbonization zone C is 450°C, observed when the temperature rises figure 1 The zone D shown is the temperature of different positions in the combustion zone. When the temperature of a certain place in the combustion zone, such as d2, is too low, open the small hole in that place, introduce air and burn it nearby, so as to raise the temperature in this place and control the bamboo to move down. The temperature of the combustion zone experienced in the process was raised to 700°C at a rate of 5°C / min and kept for 40 minutes, and then raised from 700°C to 1100°C at a rate of 5°C / min and held for 2 hours. The bamboo charcoal cooling pipe and bamboo vinegar liquid condens...

Embodiment 2

[0038] The pilot test was carried out in a 16-tube conjoined moving bed carbonization furnace with Mengzong bamboo chips (about 40cm long) with an average moisture content of 30%, the temperature of each temperature measurement point, the drying zone A was 200 °C, and the pre-carbonization zone B is 270°C, and carbonization zone C is 500°C. When the temperature rises, part of the combustion gas introduced from the external combustion type and part of the non-condensable gas from the bamboo vinegar liquid condenser are combusted at the same time, so that the temperature of the combustion zone rises to 750 at a rate of 15°C / min. ℃ and keep it warm for 80 minutes, then raise the temperature from 750 ℃ ​​to 1500 ℃ at a rate of 15 ℃ / min and keep it warm for 8 hours, spray water vapor into the 1500 ℃ area for 60 minutes, the bamboo charcoal cooling pipe and the bamboo vinegar liquid condenser adopt natural cooling, the discharge temperature is 30°C. Take out the bamboo charcoal afte...

Embodiment 3

[0042] The pilot test was carried out in a 16-tube conjoined moving bed carbonization furnace with Mengzong bamboo chips (about 40cm long) with an average moisture content of 35%, the temperature of each temperature measurement point, the drying zone A was 150°C, and the pre-carbonization zone B is 275°C, and carbonization zone C is 450°C. When the temperature rises, part of the combustion gas is introduced from the external combustion type, so that the temperature of the combustion zone is raised to 720°C at a rate of 12°C / min and kept for 60 minutes, and then at a rate of 12°C / min. The temperature was raised from 720°C to 1000°C and held for 6 hours. Carbon dioxide was sprayed into the 1000°C area for 30 minutes. The bamboo charcoal cooling pipe and the bamboo vinegar liquid condenser were naturally cooled, and the discharge temperature was 20°C. After 8 days of continuous operation (not including the furnace warming time), take out the bamboo charcoal, soak the taken out bam...

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Abstract

The invention relates to the bamboo processing field, in particular to a dry distillation charring method for bamboos, which comprises the following steps of: delivering the bamboos in a vertical moving bed through a drying zone, a pre-charring zone, a charring zone, a calcining zone and a cooling zone in turn, exhausting pyrolysis gas from the top to a bamboo vinegar condenser, and condensing the pyrolysis gas to obtain bamboo vinegar; controlling the temperature difference of different positions of a burning zone to perform step temperature rise, heating the bamboos to between 700 and 750 DEG C at the speed of 5 to 15 DEG C per minute during moving downwards in the burning zone and preserving the heat for 40 to 80 minutes, and then heating the bamboos to between 1,000 and 1,500 DEG C atthe speed of 5 to 15 DEG C per minute and preserving the heat for 2 to 8 hours; and preferably, soaking the taken-out bamboo charcoal into solution containing 2 to 4 percent of acid for 1 to 2 hours,taking out the bamboo charcoal and cleaning the bamboo charcoal by using clean water, and then drying the bamboo charcoal in a drying kiln for 0.5 to 1 hour. The bamboo charcoal has high charring degree, strong conductivity and high antistatic capability; the adsorption property of the bamboo charcoal is higher due to the step temperature rise; and the surface of the bamboo charcoal is bright andthe quality is stable due to solution soaking, and the method is suitable for application of health-care bamboo charcoal.

Description

technical field [0001] The invention relates to the field of bamboo processing, in particular to a method for dry distillation and carbonization of bamboo. Background technique [0002] Bamboo is composed of cellulose, hemicellulose and a small amount of lignin. Bamboo charcoal is decomposed and carbonized by these three substances to varying degrees. [0003] As a pyrolysis product of bamboo, bamboo charcoal is one of the effective ways for comprehensive utilization of bamboo with high added value. Bamboo charcoal is widely used in industry, agriculture, environmental protection, medical treatment, electronics and other fields due to its outstanding functions of moisture absorption, filtration, purification, disinfection, heat storage, heat preservation, and conductivity. [0004] According to the temperature change in the thermal decomposition process, bamboo activation treatment is mainly divided into four processes: [0005] First, the drying process: mainly to evapora...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/02C10B57/10C10B49/02C10C5/00C01B31/10C01B32/336
CPCY02E50/14Y02E50/10
Inventor 丁建中
Owner ZHEJIANG JIANZHONG BAMBOO IND
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