Study On Manufacturing Technology Of Bio-char From Moso Bamboo And Chinese Fir Blends

Bamboo bio-char is one of the effective ways to utilize bamboo residues as energy products.However,the resource is a key factor to limit the large-scale production for bio-char enterprises.In this research,chemical components and co-pyrolysis characteristics of moso bamboo and Chinese fir residues were investigated.The mechanism rod from moso bamboo/Chinese fir blends were manufactured using molding machine.The effect of moisture content?MC?of raw materials,the ratios of moso bamboo/Chinese fir and forming temperatures on properties of mechanism rod was determine to get the optimum manufacturing process.Then,they were carbonized with different carbonization temperature,holding time and heating rate.The optimum bio-char of moso bamboo/Chinese fir blends was finally obtained.The economic benefits evaluation of the bio-char was carried out based on technical economic method.The main results were listed as follows:?1?The lignin content of W,B₀,B₁and B₂were 30.58%,27.56%,30.70%and 25.36%,the crystallinity were 34.42%,40.15%,40.09%and 37.79%.B₁/W blend had the highest calorific value compared with B₀/W and B₂/W blends.B₁/W blends also had a better pyrolysis process.There was no synergistic reaction during co-pyrolysis process of moso bamboo and Chinese fir.When conversion rate increased from 0.1 to 0.8,the activation energies of B₁10W0,B₁9W1,B₁8W2,B₁7W3,B₁6W4 and B₁0W10 were respectively 156.76 KJ/mol-170.12KJ/mol,160.80 KJ/mol-171.17 KJ/mol,172.87 KJ/mol-181.66 KJ/mol,148.38 KJ/mol-155.96KJ/mol,139.58 KJ/mol-145.36 KJ/mol and 146.44 KJ/mol-149.26 KJ/mol.?2?The optimum process of mechanism rod from moso bamboo/Chinese fir blends was that moisture content was 4%,molding temperature was 520?and mixing ratios of moso bamboo to Chinese fir was 7:3.The apparent density,crushing resistance and breaking rate of mechanism rods manufactured using optimum process were 1.117 g/cm³,96.71%and 4.45%,respectively,the moisture content,ash,volatiles and fixed carbon were 2.58%,0.86%,79.86%and 19.28%,respectively,the contents of C,H,N,S and calorific value were 50.17%,6.04%,0.04%,0.04%and 19815 J/g,respectively,which met the requirement of?Bamboo-based biomass molded fuel??LY/T 2552-2015?.?3?The optimum carbonization process of mechanism rod from moso bamboo/Chinese fir blends were carbonization temperature of 600?,refining time of 30 min,heating rate of 1?/min at the temperature range of 30?-200?and 200?-450?and 5?/min at the temperature range of 450?-600°C.The moisture content,ash content,volatiles,fixed carbon and calorific value of bio-char manufactured through the optimum carbonization process were 0.7%,3.33%,7.73%,88.94%and 34019 J/g,respectively,which met the requirements of the first grade of the standard?Bamboo charcoal for fuel??GB/T 28669-2012?.?4?The PBP of the bio-char from moso bamboo/Chinese fir blends was 2.44 years,which was lower than the 2.89 years of bamboo bio-char plant.This indicated that the risk of investment was smaller.The IRR and the NPV of blend bio-char were respectively 52.35%and$3,952,190,which were higher than 44.40%and$3,103,260 of bamboo bio-char plant.The decrease of operation cost and the increase of sales price could lead to higher IRR.The effect of sales price on IRR was greater than that of operation cost.Achieving diversified production of raw materials and reducing operating costs of products could get better returns.