【摘要】：本文以蘭炭末為原料制備出新型清潔燃料-水炭漿,對(duì)我國煤化工、冶金等高耗能、高污染行業(yè)的技術(shù)升級(jí)、節(jié)能減排及產(chǎn)業(yè)鏈延伸具有重要的意義。主要研究了粒度級(jí)配、添加劑種類和復(fù)配方案、溫度及攪拌作用等因素對(duì)水炭漿的粘度、流動(dòng)性及穩(wěn)定性等的影響規(guī)律,確定了最佳制備工藝及技術(shù)參數(shù),并利用熱重分析及Aspen Plus模擬對(duì)水炭漿的燃燒過程和燃燒性能進(jìn)行了分析評(píng)價(jià)。研究表明,添加劑及粒度級(jí)配是影響水炭漿濃度、粘度和穩(wěn)定性的重要因素。使用復(fù)配分散劑可以極大提高單型分散劑的分散和穩(wěn)定性能,木質(zhì)素磺酸鈉(SL)與聚羧酸系分散劑(PC)復(fù)配后,SL彌補(bǔ)了PC在蘭炭表面縮合芳環(huán)主體上吸附性能差的缺陷,使其立體吸附于蘭炭的芳香核上,使SL和PC的分散和穩(wěn)定性能得到了協(xié)同增強(qiáng),當(dāng)SL-PC添加量為1.0wt%、最佳配比SL:PC=2:1時(shí)的最高成漿濃度可達(dá)到65.50%。篩分分級(jí)可以獲得最優(yōu)級(jí)配M45um:M45μm~74um:M74μm~125um:M125μm~250um=5:2:2:1,使蘭炭末(研磨時(shí)間250s)最大成漿濃度從63.53%提高到64.57%。磨制分級(jí)在研磨時(shí)間一定時(shí),成漿性不如篩分分級(jí),但通過增加研磨時(shí)間可獲得較高的成漿濃度,當(dāng)研磨時(shí)間為750s,磨制分級(jí)制漿最大成漿濃度為66.76%。高溫和過度攪拌均不利于水炭漿的制備,保持適當(dāng)?shù)臏囟�、攪拌時(shí)間及攪拌速度是制備高濃度水炭漿的關(guān)鍵條件。水炭漿的最佳制備工藝條件為:磨制分級(jí)750s、復(fù)配分散劑SL-PC(添加量為1.0wt%,復(fù)配比例SL:NSF=2:1)、穩(wěn)定劑CMC(添加量0.02wt%)、制備溫度25℃、攪拌速度800r/min和攪拌時(shí)間10min,在該條件下蘭炭末的最大成漿濃度為66.02%,此時(shí)水炭漿的表觀粘度為911.02mPa.s、流動(dòng)時(shí)間為49s以及析水率0.56%。TG-DTG、DSC分析表明,水炭漿的燃燒過程可分為水分蒸發(fā)、揮發(fā)分析出燃燒及殘?zhí)亢蛽]發(fā)分共同燃燒直至燃盡三個(gè)階段,與水煤漿相比水炭漿存在熱值低、燃燒滯后、著火穩(wěn)定性差等缺點(diǎn)。Aspen Plus模擬分析結(jié)果表明,進(jìn)料物流參數(shù):蘭炭末流量1000kg/hr、水量538kg/hr以及助燃空氣流量9000kg/hr時(shí),BURN溫度可達(dá)1502.41℃,熱量達(dá)11886MJ/hr。水炭漿燃燒過程具有燃燒高效充分(96.46%)、煙氣中污染氣體排放量低(NO+NO2+SO2+SO3=0.52wt%)、粉塵含量少(0.013kg/hr)且粒徑小(0.32μm~0.61μm)等優(yōu)點(diǎn),是一種清潔高效的環(huán)保型燃料,并且蘭炭末價(jià)格低廉,具有非常好經(jīng)濟(jì)效益和市場(chǎng)潛力,值得深入研究與推廣應(yīng)用。
[Abstract]:In this paper, a new clean fuel, water carbon slurry, is prepared from blue charcoal powder, which is of great significance to the upgrading of technology, energy saving and emission reduction and the extension of industrial chain in coal chemical industry, metallurgical industry and other high energy consuming and high pollution industries in China. The effects of particle size gradation, kinds of additives and blending schemes, temperature and agitation on the viscosity, fluidity and stability of water-carbon slurry were studied, and the optimum preparation process and technical parameters were determined. The combustion process and combustion performance of water carbon slurry were analyzed and evaluated by thermogravimetric analysis and Aspen Plus simulation. The results show that additives and particle size gradation are important factors affecting the concentration, viscosity and stability of water carbon slurry. The dispersion and stability of the monodispersant can be greatly improved by using the compound dispersant. After the addition of sodium lignosulfonate (SL) and polycarboxylic acid dispersant (PC), SL makes up for the poor adsorption performance of PC on the condensed aromatic ring on the surface of blue carbon. The dispersion and stability of SL and PC were enhanced synergistically by stereosorbent adsorption on the aromatic nuclei of blue charcoal. When the SL-PC content was 1.0 wt, the highest pulp concentration reached 65.50% when the optimum ratio of SL:PC=2:1 was 1.0 wt. The optimal gradation of M45um:M45 渭 m~74um:M74 渭 m~125um:M125 渭 m was obtained by screening and grading, and the maximum pulp concentration of blue charcoal powder (lapping time 250: 2: 1) was raised from 63.53% to 64.57%. When the grinding time is fixed, the pulping ability is not as good as sifting classification, but the higher pulp concentration can be obtained by increasing the grinding time. When the grinding time is 750 s, the maximum pulp concentration of grinding graded pulping is 66.76. High temperature and excessive stirring are not conducive to the preparation of water carbon slurry. Keeping proper temperature, stirring time and stirring speed are the key conditions for the preparation of high concentration water carbon slurry. The optimum preparation conditions of water-carbon slurry are as follows: grinding and grading 750s, compound dispersant SL-PC (1.0wtwt, SL:NSF=2:1), stabilizer CMC (0.02wt%), preparation temperature 25 鈩，

本文編號(hào)：2314090