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Method for preparing baked charcoal with discarded poplar wood

A technology of roasting and wood powder is applied in the field of preparing roasted carbon and pyrolysis to prepare roasted carbon, which can solve the problems of unfavorable large-scale industrial production, high nitrogen price, low energy density and the like, and achieves good industrial application prospects, low production cost, Simple production process

Inactive Publication Date: 2016-07-20
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of biomass as energy has the following disadvantages: low calorific value, low energy density, high moisture content, etc.
[0003] Nitrogen is often used as an inert atmosphere in the prior art, but nitrogen is expensive, which is not conducive to large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Pulverization: Use a pulverizer to pulverize the discarded poplar wood, and use a sampling sieve to obtain wood powder with a particle size of 20-40 mesh.

[0023] (2) Air-drying: the above-mentioned wood powder is naturally dried to obtain air-dried wood powder with a moisture content of 20%.

[0024] (3) Pyrolysis: Take the above-mentioned air-dried wood powder and put it into a tube-type carbonization furnace, and continuously feed carbon dioxide gas with a purity of 99.99% into the tube-type furnace at a rate of 100 mL / min at a rate of 10 °C / min. Heating the tubular reactor so that the temperature of the tubular reactor rises from room temperature to 340° C., maintains this temperature for 20 minutes, then stops heating, and the tubular furnace is naturally cooled to room temperature to obtain solid product roasted charcoal. The calorific value of calcined charcoal is 25MJ / kg, and the water absorption rate in saturated air at 25°C is 6%.

Embodiment 2

[0026] (1) Pulverization: use a pulverizer to pulverize the discarded poplar wood, and use a sampling sieve to obtain wood powder with a particle size of 100-200 mesh.

[0027] (2) Air-drying: the above-mentioned wood powder is naturally dried to obtain air-dried wood powder with a moisture content of 5%.

[0028] (3) Pyrolysis: Take the above-mentioned air-dried wood powder and put it into a tube-type carbonization furnace, and continuously feed carbon dioxide gas with a purity of 99.99% into the tube-type furnace at a rate of 500mL / min at a rate of 10°C / min. Heating the tubular reactor so that the temperature of the tubular reactor rises from room temperature to 240° C., maintains this temperature for 60 minutes, then stops heating, and the tubular furnace is naturally cooled to room temperature to obtain solid product roasted charcoal. The calorific value of calcined charcoal is 19MJ / kg, and the water absorption rate in saturated air at 25°C is 16%.

Embodiment 3

[0030] (1) Pulverization: use a pulverizer to pulverize the discarded poplar wood, and use a sampling sieve to obtain wood powder with a particle size of 20-80 mesh.

[0031] (2) Air-drying: the above-mentioned wood powder is naturally dried to obtain air-dried wood powder with a moisture content of 10%.

[0032] (3) Pyrolysis: Take the above-mentioned air-dried wood powder and put it into a tube-type carbonization furnace, and continuously feed carbon dioxide gas with a purity of 99.99% into the tube-type furnace at a rate of 300mL / min at a rate of 10°C / min. Heating the tubular reactor so that the temperature of the tubular reactor rises from room temperature to 300° C., maintains the temperature for 20 minutes, then stops heating, and the tubular furnace is naturally cooled to room temperature to obtain a solid product, calcined charcoal. The calorific value of calcined charcoal is 23MJ / kg, and the water absorption rate is 8% in saturated air at 25°C.

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Abstract

The invention relates to a method for preparing baked charcoal with discarded poplar wood and belongs to the technical field of biomass utilization. In the method, the baked charcoal is prepared by: subjecting discarded poplar wood from industrial processing as a raw material to pulverizing, air drying and pyrolysis. The pyrolysis is carried out with a tubular furnace in the carbon dioxide atmosphere at 240-340 DEG C for 20-60 min. The method enables the discarded poplar wood from industrial processing to be utilized effectively, benefiting environmental protection; pyrolytic conditions are mild, no high-tension equipment is required, and production equipment is simple; the quality of a produced product is greatly higher than that of the raw material, the product has caloric value up to 25 MJ / kg and the product has a promising industrial application prospect.

Description

technical field [0001] The invention belongs to the field of biomass processing, and relates to a method for preparing roasted charcoal, in particular to a method for preparing roasted charcoal by pyrolyzing waste poplar as raw material. Background technique [0002] At present, with the aggravation of climate problems caused by the global warming effect, the use of renewable biomass to replace fossils is receiving increasing attention. Biomass resources are rich in content, and as an environmentally friendly fuel, its use does not increase carbon dioxide emissions. The main components of biomass are carbon and oxygen, and also contain a small amount of elements such as hydrogen and nitrogen. The utilization of biomass as energy has the following disadvantages: low calorific value, low energy density, high moisture content, etc. The preparation of roasted charcoal by pyrolysis of biomass is an important way of biomass utilization. During the pyrolysis process, dehydrogenat...

Claims

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Application Information

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IPC IPC(8): C10B53/02C10B57/10C10B49/02C10L5/44
CPCC10B49/02C10B53/02C10B57/10C10L5/447C10L2290/02Y02E50/10Y02E50/30
Inventor 陈乐煊李明飞吴小菲
Owner BEIJING FORESTRY UNIVERSITY
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