This text completely and systematically studies the status and the development of the pyrolysis and the fluidization of biomass, which distill the bio - oil in the domestic and international area, as well as the existing problems. this thesis primarily include following aspects : ( l ), by experimenting and measuring the energy ( heat value ) and the content of c, h, n chemical element of right 20 kinds of common biomass, on the base of the experimental result, and respectively established the biomass energy predict experiment formula with the element of h and c is from change, and passed the ro. os examination, which provides the basis and convenience for flash pyrolysis fluidization device energy to convert the rate to compute with biomass energy utilization calculation ; ( 2 ), proceeded the tg and dtg experimentation equal velocity ( 10 ? / min, 20 ? / min, 40 ? / min, 60 ? / min ) heating and constant temperature heating by studying on eight kinds of biomass samples, according to the experimental data and arrhenius formula, we established the dynamics model of pyrolysis of, then, using the goast - redfern and p function, we also solved the dynamics parameters and analyze out every kind of biomass ' s frequency factor and parameters of activation energy, and established the every kind of dynamics model of pyrolysis of biomass, all of these provide the theories and basis to make sure the reactor ' s flash pyrolysis work temperature scope design and the describing of pyrolysis reactor dynamics ; ( 3 ), in order to study and ascertain the process of heat completely getting to pyrolysis time of varied size biomass particles, we observed and measured the ratio of length and diameter ( l / d ) with the varied biomass through electron microscope, we concluded the l / d ratios usually is from 5. 0 to 6. 0, the average is 5. 3 ; ( 4 ), we studied the process of biomass transiting and the theory of complete pyrolysis time with the theory of complicated heat field, we got the time ( t ) of the varied size biomass particles arriving to complete pyrolysis, and we knew that the complete pyrolysis time and the time which get to the biggest production ratio are identical, all of these studies provide the theory base for design and forecasting the flash pyrolysis reactor solid state resort time ; ( 5 ), according to the above experiment result, synthesize to make use of the engineering the mechanics, engineering the material, machine the design to learn the principle, deduce, establish the theory of rotation cone flash pyrolysis reactor material resort time ( t ) and reasonable rotation velocity ( or frequency ) relation theory ; and ( 6 ), we gave the reactor ' s smallest cone angle certain, reactor cone wall strength design theory, the reactor production ability theory, the power design method and the critical rotation velocity theory
本文較全面、系統地綜述了國內外生物質
熱解液
化制取生物燃油技術研究發展現狀及存在的問題,主要研究內容有: ( 1 )實驗、測定了20種常見生物質的能量(發
熱量)和c 、 h 、 n元素含量,根據實驗結果分別建立了以h和c為自
變量的生物質能量預測經驗公式,並通過r _ ( 0 . 05 )檢驗;為閃速
熱解液
化裝置能量轉
化率計算和生物質能量利用率計算提供了依據和方便; ( 2 )選擇了8種生物質試樣作了等加
熱速率( 10 min 、 20 min 、 40 min 、 60 min )和恆溫加
熱的tg和dtg實驗,根據實驗數據和阿倫尼烏斯公式建立了生物質
熱解反應動力學微分方程,並採用goast - redfem積分法和p
函數對其動力學參數進行了求解,解析出各種生物質的頻率因子和活
化能參數,進而建立了各種生物質的
熱解動力學模型,為科學確定反應器的閃速
熱解工作溫度范圍及
熱解反應動力學描述,提供了理論和依據; ( 3 )為研究和確定不同尺度的生物質顆粒中心達到全
熱解的時間,在體視顯微鏡下對不同粒度的生物質顆粒的長徑比進行了實驗觀察和測定,得出生物質的長徑比( l d )一般在5 . 0 6 . 0之間,平均為5 . 3的結果; ( 4 )採用復雜溫度場傳
熱學理論對生物質傳
熱過程及充分
熱解時間理論進行了研究,解析推導出了不同尺寸生物質顆粒中心溫度達到充分
熱解溫度的時間( t ) ,得出了理論推導的充分
熱解時間與最大產油率的
熱解時間相一致的結果,為閃速
熱解反應器固相滯留時間設計和預測提供了理論依據; ( 5 )根據上述實驗結果,綜合運用工程力學、工程材料、機械設計學原理,推導、建立了轉錐式閃速
熱解反應器物料滯留時間( )與轉速(或頻率)合理匹配理論; ( 6 )提出了轉錐式閃速
熱解反應器的最小錐角設計、錐壁強度設計、生產能力設計理論和功率計算方法及臨界轉速理論等。
Firstly, wall ’ s transfer matrix is deduced by laplace transformation based on 3r2c thermal network model. secondly, frequency response of transfer matrix is calculated. thirdly, we make the frequency response of transfer matrix of stimulation model equate the theoretical frequency response of wall transient heat conduction by applying appropriate identification algorithm, from which we can obtain every polynomial ’ s coefficient of model transfer function, then each parameter of resistance and capacitance is calculated by appropriate optimization algorithm
首先,根據模擬
熱流網路模型用拉普拉斯
變換推出墻體的傳遞矩陣;然後,計算傳遞矩陣的頻率響應;最後,採用頻域回歸方法求出模型傳遞
函數各次項的系數,進而通過一定的優
化演算法確定模型的各個
熱阻、
熱容參數,使通過模型建立的多項式s -傳遞
函數與墻體瞬時傳
熱的理論超越s -傳遞
函數完全等價。
In the article, the mechanism of temperature field has been researched and the math model of 3d unsteady temperature field is established according to analyze the cracking reason, produce mechanism of temperature crack, the specialty of crack in mass concrete. the thermal conduction equations are converted into extremum of functional analysis through calculas of variations
本文通過對大體積混凝土裂縫的成因,溫度裂縫的產生機理,溫度裂縫的特點,研究了大體積混凝土溫度場機理,建立了數學模型,並用
變分原理將三維瞬態溫度場的
熱傳導方程問題轉
化為泛
函的極小值問題。
Based on the test data, and by using the distillerys grain drying curve and drying - rate curve, this paper analysed the distillerys grain drying process, and demonstrated the characteristics of the drying and the change of drying - rate of the distillerys grain in heat - air penetrating bed
根據試驗所測數據,利用三次樣條插值函數擬合酒精糟乾燥曲線和乾燥速度曲線,深入分析酒精糟的乾燥過程,得出酒精糟在熱風穿床乾燥方式下的乾燥特點和乾燥速度的變化規律。