Method for preparation of biochar by low-temperature oxygen controlled carbonization of biological straw
A bio-stalk and bio-char technology, applied in carbon preparation/purification, chemical instruments and methods, bio-fuels, etc., can solve the problems of high production cost and high energy consumption, and achieve easy operation, low reaction temperature, and high char formation rate high effect
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Embodiment 1
[0019] Put 5 g of dry straw powder that has been crushed and passed through a 20-mesh sieve into a tube furnace, and air is introduced into the tube furnace at a ventilation rate of 30 mL min -1 (Keep the partial pressure of oxygen in the furnace around 20kPa), at 10°C·min -1 The heating rate was raised to 235°C, and the temperature was kept constant for 5 hours to obtain an acid value of 3.0mmol·g -1 2.8g of biochar.
[0020] The ammonia gas adsorption test was carried out on the obtained biochar, and the specific steps were as follows: the prepared ammonia water of different concentrations and the prepared biochar were placed in the same closed space, and the amount of ammonia adsorbed by the biochar at different times was recorded. The adsorption capacity changes with time as figure 1 As shown, it can be seen from the figure that the biochar prepared by the present invention has a remarkable adsorption effect on alkaline gas, and can be used as an alkaline gas adsorbent ...
Embodiment 2
[0022] Put 5 g of dry straw powder that has been crushed and passed through an 80-mesh sieve into a tube furnace, and then feed oxygen into the tube furnace at a ventilation rate of 30 mL min -1 (keep the partial pressure of oxygen in the furnace around 100kPa), at 15°C min -1 The heating rate was increased to 265 °C, and the temperature was kept constant for 3 hours to obtain an acid value of 3.3 mmol g -1 2.3g of biochar.
Embodiment 3
[0024] Put 5 g of dry straw powder that has been crushed and passed through a 20-mesh sieve into a tube furnace, and air is introduced into the tube furnace with a gas flow rate of 80 mL min -1 (Keep the partial pressure of oxygen in the furnace around 20kPa), at 15°C min -1 The heating rate was increased to 280°C, and the temperature was kept constant for 5 hours, and the acid value was 3.8mmol·g -1 1.8g of biochar.
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