Main influence factors on desulfurization of coal by sulfolobas Main influence factors on desulfurization of coal by sulfolobas

Main influence factors on desulfurization of coal by sulfolobas

  • 期刊名字:中南工业大学学报
  • 文件大小:600kb
  • 论文作者:何德文,彭长宏,王云燕
  • 作者单位:School of Metallurgical Science and Engineering
  • 更新时间:2020-07-02
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论文简介

Vol I0 Ny. 2ne2003Article:I0o5·9784(203)020304J. CENT. SOUTH UNIV. TECHNOLMain influence factors on desulfurization of coal by sul folobasHE De-wen(何德文), PENG Chang-hong(彭长宏), WANG Yun-yan(王云燕)(School of Metallurgical Science and Engineering, Central South UniversityChangsha 410083, China)Abstract: By orthodox expthe main influence factors of desulfurization by sulfolobus of plI value, temrature, coal slurry concentrnd coal granularity are studied in detail and the optimal experimental conwere also obtained. The expI results demonstrate that sul folobas being kind of linking-heat, acidophilic andin 10 d and its desulfrization rate can be greatly affected by the four factors above mentioned. Therefore the optimum conditions of desulfurization are obtained by comprehensive experiment and they are as following: pH value 3, temperature 70Tcoal slurry concentration 10% and coal granularity 150 um, respectively. Moreover, the repetition experimental reIts confirm that the desulfurization by sul folobas is steady.Key words: sul folobus: desulfurization orthodox experimentCLC number: x7013Document code: A1 INTRODUCTIONed outdoors were enriched and brought up in culture medium, and then were separated to obtainHigh sulfur coal which lets out poisonous and sul folobas. Subsequently the bacterium liquid washarmful gas such as sulfur dioxide in the process of made for the next experiment by purification andcoal combustion, is a main factor to form great area bred in relative culture medium.acid rain and occupies one third reserves of total coal inChina. Man has paid much attention to serious envi- 2. 2 Coal samples preparationronment pollution made by sulfur in coal and searchedCoal samples, collected from Chongqing areafor a speed, low-cost and effective technology of desul- were high sulfur coal with 2. 45% total sulfurfurization which has become a significant environment 1. 87% inorganic sulfur and 0. 58% organic sulfurprotection task nowadays! 1and were crashed and screened out into differentCoal desulfurization can be sorted into fore-burn- coal powders of 90, 150 and 240 um.flame- burning and after-burning by burningprocess 2 and also sorted into physics, chemistry and 2. 3 Desulfurization conditionsbiology method by different measures[3.l. Of all des-23.by rocking bottleulfurization methods, fore-burning desulfurization byThe above coal powders were gotten and mademicroorganism which can remove sulfur in coal accom- into 100 mL coal slurry in 250 ml, triangle flask ac-panied by oxidation-reduction reaction at normal tem. cording to Table 1, then the cultivated bacteriumperature and pressure, has more notable advantages of was filtrated through 0. 2 um film and added intousing less energy, fewer operational cost 6. The fac- coal slurry. The triangle flask were placed intoors of desulfurization by sul folobas are studied in this SHZ-88 model water-bathing vibrator to breed mipaper.croorganism under the condition with differenttemperature and rotating speed of 120 r/min. to2 EXPERIMENTALavoid water vapor, distilled water was added at interval time to keep coal slurry to be 100 ml2. 1 Experimental bacterium2.3.2 Post-treatment of coal samplesThe experimental original bacterium, collect中国煤化工 ed by microbeThe National AdvanHE De-wen, postdoctor, born in April 1968CNMHG220Ml and resouree, environ-Recelved date: (ct. 8, 2002Journa CSUT Vol 10 No. 2 2003were soaked with 4 mol/ L hydrochloric acid after difference between what total sulfur and inorganiccentrifugal separation. Super clear liquid were dis- sulfur!?arded, and deposits was washed to neuter by dtilled water and dried at 60-80 C for analysis.3 RESULTS AND DISCUSSION2. 4 Analysis methods3. 1 Optimum conditions of removal total sulfurtion-reduction method, and inorganic sulfur by colnsidering various kinds of factors, orthodoxorimetry method. The amount of organic sulfur experiment table is designed according to four factohaving complex and less component, equals to the at three level of L,(3), which is shown in Table 1Table 1 Removing rate of total sulfur and inorganic sulfur by sul folobaTemperature/℃te of total Rate of inorganicsulfur/%43.8532.913832.8034.8629.742548.5336.30four factoTable 2 Results of removing total sulfurorthodox experimentIndexCoal slurry. Coal granularity phaperaturekg44.013.646.9447,59Test numberTable 3 Results of removing inorganic sulfur inI total sulfur: 2- inorganic sulfurorthodox experiFig 1 Orthodox experiment of desulfurizationCoal slurry Coal granularityconcentration/%44.1041.4145.12The orthodox experiment result of desulfurize-tion Is shown in FIgk45.6249.9953.20ulfurization rate. Sul folobas can effectively remove12.298.0total sulfur and inorganic sulfur, and the maximumdesulfurization rate reaches 48. 53% and 41. 36%In Fig. 2, all kinds of factors of removing totalrespectively. Desulfurization rates are influenced by sulfur are ordered in turn as pH value, tempera-various kinds of factors, under the same condition, ture, coal granularity and coal slurry concentra-removing rate of total sulfur is better than that of tion The optimum conditions of removing totalinorganic sulfur because sul folobas has good adapt- sulfur are as follows pH value 3, temperature 70ability to organic sulfund coal slurryAccording to analytical method of orthodox ex- tra中国煤化工40 um and150meriment.the data of total sulfur in Table I are dis- anCNMH Gere are almost noposed of and changed to form Table 2 and Tableun cval granularity is awhere k1, k2, k3 stand for correlative coefficients of dopted to be 150 um for less costHE De-wen, er ul: Main influence fat tors on desul furizutiun of coal by sulfolobusmoving inorganic sulfur are ordered as pH value, activity of bacterium increases, so removing rate n. GAccording to Fig 3, all kinds of factors of re-On the other hand, at high temperature,thetemperature or coal granularity, coal slurry concen.creasestration. The optimum conditions of removing inor- 3. 2. 2 Effect of coal granularity and coal slurryganic sulfur are as follows: pH 3, temperature 70centration on desulfurizationC, coal granularity 150 um and coal slurry concenIn Fig. 2 and Fig 3, desulfurization of coal aretration 15%. At two levels of 10% and 15% coal affected by coal granularity and coal slurry concen-slurry concentration, there are almost no differ- tration, and removing rate of total sulfur obviouslyences. So the optimum experiment condition 15% increases with the decrease of coal granularity.coal slurry concentration is adoptedWhen coal granularity excessively decreaseving rate of total sulfur will decrease. The reason is圆k1四k國kthat microorganisms lie in coal slurry in two waysof adsorption and dissociation, and adsorptive microorganism has more effective desulfurization than么么么么么么么团dissociative microorganism because there are much么么么么么more adsorptive microorganisms on greater exteriorarea with smaller coal granularity le- 1). When cogranularity is too fine, unit amount of bacterium onsurface area decreases and desulfurization rate falOn the other hand, desulfurization rate decreaseswith high coal slurry concentration on account of2. 3 Comprehensive optimum condition of remo-Optimum qualification of removingving total and inorganic sulfur by sul folototal sulfAs inorganic sulfur accounts for the majorityof sulfur in coal, its removal may basically represent coal desulfurization. From Fig. 2 and Fig. 3can be seen that the sequence of influence factor閉der comprehesive condition is consistent with thatunder comditions of total sulfur or inorganic sulfurdesulfurization. Therefore comprehensive optimumconditions by sul folobas are ph value 3, tempera-ture 70 C, coal granularity 150 um and coal slurry10汤3. 3 Repetition experiment under optimum condiTest numbertions of removing sulfurTo verify reliability of optimum condition, sixFig. 3 Optimum qualification of removingexperiments were carried out. The results are listedinorganic sulfurin Table 4, showing that desulfurization by sulur up3. 2 Effect of main influencing factorsto 48. 57%, and also remove inorganic sulfur up to3.2. Effect of ph value and temperature on desul- 41. 71% under the optimum conditionfurizationFrom Fig. 2 and Fig, 3, it can be seen that sulTable 4 Repetition experiment result of desulfolwbas is a linking-heat and acidresistivity bacterium. It would have maximal activity to make desul- No. Removing rate of Removing rate of Removing rate oftotal sulfur/% inorganic sulfur/% organic sulfur/%furization under circumstance of ph 3 and tempera-ture7o℃°. If pH value is too low and aciditytoo high, positive direction reaction in the reaction中国煤化工37,50equation below must be restrained, so the optimumCNMHG37.504FeS2+1502+2H2O=2Fe2(SO4)3+2H2SO116Journal CSUT Vol. 10 No. 2 2003rization of coal [J]. Progress in Chemistry (in Chi4 CONCLUSIONSnese),l997,9(1):7989[4] WU Geng. CHEN Xudong, XIA Tao, Current situa1)Sul folohas is a kind of linking-heat, acido-tion and development prospect of microbe antisulfidephilic and self-supported bacterium with doubletechnique [J]. Environmental Protection ( in Chinese),characters, which can effectively remove inorgani2002,(l):21-24nd organic sulfur in coal. It can superlatively get [5] Garoia F, Blazquez M. A comparative study of therid of 48. 57% total sulfur and 41. 71% inorganicbiodesulfurization of two Spanish coals with thiobacillussulfur within 10 d, and its desulfurization rate canand sulfolobus [J]. Biorecovery. 1993, 2(3): 179-194.be obviously affected by such factors as ph valve, L6]ZHONG Hui-fang. II Ya-qing. Coal desulfurization byicroorganism [J]. Journal of Environmental Sciencetemperature, coal granularity, coal slurry concen( in Chinese),1992,l2(2):216222tration[7] QING Yi. iodimetric determination of low sulfur LJ2)The optimum qualification of desulfurizationChemical Analysis( Part B)( in Chinese), 2001, 37(4)can be achieved from experimentation as ph value [8] LIN Wu-tao, SU Shi-hua, ZHANG Qi-wei. Research3, temperature 70C, coal slurry concentrationon measuring the content of sulphur in surphurie iron10%, and coal granularity 150 umore []. Journal of Sanming College( in Chinese2001,18(2):40-4REFERENCES[9] REN Yan-qiu, ZHENG Kun-can, ZHANG Jie-yu. Ex-perimental study on microbial desulfurization of coal[J]. Journal of Baotou University of Iron and Steel[1] CHEN Peng. Characteristics and distribution of sulfurTechnology( in Chinese), 2000,19(2):167-171in Chinese coals and desulfurization [J]. Coal Conver- [10 ZHONG T, HU W. Surface electrochemical controlsion (in Chinese),1994. 17(2):1-9.for fine coal and pyrite separation []. Proc Annu[2] CHENG Sheng-gao, WANG Yan-ling, YUN Luojia,Coal Prep,1992,(8):404-41lStored-up status of organic sulfur in high sulfuI[l1] ZHANG Ming-xu, CAO Ling, XU Chuyan, et aland desulfurized mechanism with microbe I]. EnvironDesulfurization of slurry microbe by pretreatment ofmental Industry in China( in Chinese),1996.(6): 34consolidating fine coal granule [J]. Coal Processingand Comprehensive Utilization( in Chinese ) 1997L3 LI Guo-hui, HU Jie-nan. Development in biodesulfu(1):45-50.中国煤化工CNMHG

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