高硫煤粉永磁干法强磁选试验研究

以平顶山庚组高硫煤粉为煤样,利用实验室自制的永磁强磁选机进行分选试验,发现:随着颗粒粒径的增大,其灰分、硫分也随之增加;该磁选机的最佳分选粒度范围为0.25～0.5mm;磁选脱除的主要是煤中黄铁矿硫,而硫酸盐硫和其他有机硫则变化不大。     

低温热解强化煤粉磁选脱硫效果的实验研究

采用自制热解装置对北宿煤进行热解,此装置与传统热解装置相比具有处理量大和操作简便等优势,能够与磁选实验相结合,热解温度400 ℃～700 ℃,氮气流量0.1 L/min,保温时间为30 min,主要研究热解温度对煤粉磁选脱硫效果的影响.结果表明:适当提高热解温度对磁选脱硫是十分有利的,且500 ℃时效果最佳,热解后半焦与原煤相比磁选脱硫率提高近40%;利用XRD分别对原煤、500 ℃半焦及半焦磁选后的精煤进行分析,发现半焦中有强磁性矿物磁黄铁矿(Fe1-xS)生成,精煤中已无黄铁矿,说明热解-磁选脱硫技术能够有效脱除煤中无机硫.依据GB/T215-2003分析试样中硫的形态,发现煤中有机硫含量高且以噻吩硫形式存在,给实现北宿煤低温预处理磁选高效脱硫造成了困难.     

磁选技术在煤炭脱硫中的应用

介绍了磁选技术在煤炭脱硫中的应用和发展现状 ,分析了磁选脱硫的优势和阻碍其发展的原因 ,对磁选脱硫机理和影响脱硫效率的因素进行了探讨 ,指出随着高新技术的发展 ,磁选脱硫的应用前景是广阔的。     

磁选铁精矿的脱硫

七宝山硫铁矿选矿厂投产后,由于矿石性质等原因,铁精矿难以达标,经济严重受损。针对这一情况,从磨矿细度入手,配合使用硫化矿的有效活化剂,并增加铁精矿脱硫作业,使铁精矿品位达到60.26％,含硫降至0.2％,脱硫作业铁回收率92.21％,产品符合国标C_(60)级Ⅰ组铁精矿质量标准。     

湿式氨法脱硫技术在煤粉锅炉烟气脱硫中的应用

由于工业的快速发展和我国缺油少气多煤的能源结构,燃煤烟气中的SO2是大气污染的主要原因之一。减少SO2污染已成为当今大气环境治理的当务之急。各种烟气脱硫工艺已在工业中被广泛的应用,结合我单位应用实例,详细阐述煤粉锅炉湿式氨法烟气脱硫技术的具体应用。     

煤炭高梯度磁选-浮选脱硫降灰试验

通过分析煤样性质,说明原煤中无机硫主要以硫化铁硫为主,有机硫较高,仅依靠物理方法很难达到理想脱除效果。通过煤粉高梯度磁选试验研究了磁介质、磁通密度、脉冲对煤炭磁选效果的影响。结果表明:聚磁介质选用不加铜套细网介质,当磁通密度为1.295 T,脉冲为25次/min时,煤粉湿法高梯度磁选脱硫效果最好,此时硫分为1.59%,精煤产率为85.44%,脱硫率为31.87%,脱灰率为38.17%,黄铁矿硫脱除率为45.02%。通过正交试验确定了最佳高梯度磁选条件为:煤粉粒度0.075 mm,磁通密度1.295 T,脉冲25次/min,可得到硫分1.35%,灰分10.37%的磁选精煤产品。最后对磁选精煤进行再浮选试验,得到最佳浮选条件为:石灰500 g/t,捕收剂1360 g/t,起泡剂90 g/t,可获得产率76.29%,硫分1.28%,灰分8.14%的精煤,产品脱硫率为57.73%,脱灰率为58.52%,黄铁矿硫脱除率为84.56%。采用磁选-浮选综合流程,煤粉基本达到理想的脱硫降灰效果,可作为煤种脱硫降灰技术方案的参考。     

天然气脱硫技术研究与展望

天然气作为一种清洁能源,在应对环境保护及能源安全等方面肩负着重要的使命。随着我国经济的不断高速发展,对清洁能源的需求也逐渐增加。现阶段,天然气正处于高速发展阶段,发展前景巨大。"十三五"期间,我国的能源环境问题将更加严峻,高含硫天然气技术面临气质和排放标准的严格要求,提高天然气中的硫回收率是当今天然气净化技术的主要研究方向。主要对国内外天然气脱硫采用的技术进行分析和对比,展望未来技术的发展方向。     

细粒煤磁选-浮选脱硫脱灰试验研究

为提高细粒煤的脱硫率和脱灰率,以甘肃中硫煤经跳汰机处理后的细粒煤为试验煤样,进行磨矿-磁选试验、高精度磁选试验和磁选精煤再浮选试验。结果表明,磁通密度1.57 T,脉冲强度25次/min,采用细网不加铜套聚磁介质时,煤泥磁选效果最好,精煤硫分为1.25%,精煤产率达到95%,煤样损失量最小。在最佳磁选条件下进行磁选精煤再浮选试验,Ca O用量1 kg/t,煤油用量1360 g/t时,煤泥浮选效果最好,得到硫分1.09%,灰分7.54%的精煤,精煤脱硫率为32.05%,脱灰率为45.63%,黄铁矿硫脱除率为50.55%。细粒煤磁选-浮选试验数质量流程表明,原煤经跳汰—破碎—筛析—磁选—浮选后,可获得产率86.03%,硫分1.09%,灰分7.54%的精煤产品,基本达到矿山要求。     

燃煤锅炉脱硫技术研究

本文叙述了化学脱硫剂在煤粉燃烧中脱硫技术的研究及国内外煤粉脱硫技术的现状。     

浅谈氨法烟气脱硫技术的应用前景

介绍了目前锅炉烟气脱硫技术及其效果,对湿式氨法脱硫技术的工艺流程、控制条件、运行效果及其应用前景进行了分析.     

Model selection for aqueous slurry coal desulphurization

Simple solid-fluid process models developed for uniform size solid bodies (screened or palletized materials), like the shrinking core model, have been applied to multifraction mixtures of solid bodies usually encountered in processing of ground coal or oil shale. The experimental conversion, measuring total effects on all of the size fractions was recalculated to the conversion of the longest surviving single fraction. The calculations used literature data on coal desulphurization by wet oxidation of pyretic sulphur and results are discussed in terms of rate limiting steps.     

Relation between dielectric property and desulphurization of coal by microwaves

Dielectric properties of various coals and aqueous NaOH solutions were determined to study thermochemical coal desulphurization by microwave irradiation. Aqueous NaOH solutions were used as media for irradiation. The coal samples were placed in a rectangular cavity and irradiated with 2450 MHz microwaves, resulting in 70–80% desulphurization efficiency.     

Fine coal desulphurization by leaching with bromine containing hydrobromic acid

Sulphur extraction from coal by leaching with bromine-containing aqueous hydrobromic acid has been investigated in the temperature range from ambient to 120 °C. This procedure was found to be selective for the removal of high levels of sulphate and pyritic sulphur within a few minutes of leaching, while no significant reduction of the organic sulphur could be observed. Leaching led to an appreciable reduction of the ash yield and the up-take of substantial quantities of bromine. The bromine can be removed as hydrogen bromide by thermal treatment under nitrogen, without significant loss of volatile matter; for reduction of the bromine level to below 0.1 wt%, treatment for at least 1 h at ≈ 500 °C was needed.     

Solvent effects in coal desulphurization by chlorinolysis near ambient temperature

The effects of solvent, temperature and reaction time on the desulphurization efficiency of the low-temperature chlorinolysis process were studied. Certain trends in sulphur reduction, chlorine uptake and extraction yield for coals undergoing slurry-phase chlorine treatment were established. Methanol-based solvent systems were found to display remarkable capabilities in coal chlorinolysis both in terms of selective sulphur extraction and high yields of coal extracts.     

煤炭干法分选技术应用场景及展望

在国家政策引领与行业推动下,我国干法选煤技术的研发能力和装备制造水平已达国际领先水平,干法选煤技术在动力煤全粒级入选、预排矸、末煤干选、低质煤提质及干湿工艺结合等方面得到成功应用;展望未来,争取更多的国家政策支持,促进干法选煤技术的快速迭代升级,科学运用干法与湿法组合工艺,实现选煤厂的高效、绿色、智能发展.     

Kinetics of chemical desulphurization of coal in aqueous ferric chloride

The kinetics of the chemical desulphurization of Lafia coal by the oxidation of the pyritic sulphur component with aqueous ferric chloride has been investigated. The oxidation rate was found to increase significantly with increasing temperature (60 to 102°C) and ferric chloride concentration (0.2 to 1.0M) but decreased with increasing coal particle size (-0.210 mm to +0.841 mm). The kinetic data were well described by the unreacted shrinking core model with the indication that the desulphurization was predominantly chemical reaction controlled. The rate of reaction was also found to be well correlated by a two-parameter pseudo-homogeneous kinetic model. The specific rate constant obtained showed a true Arrhenius temperature dependence.     

适宜"三高"煤利用的煤气化技术探讨

我国煤炭资源中高灰、高硫、高灰熔点煤(简称"三高"煤)所占比例较高,开发高效、洁净的"三高"煤加工技术对我国煤炭资源的可持续发展和利用有重要意义.本文通过对"三高"煤煤质特点进行分析,结合国内外发展较快的粉煤气化技术,综述了"三高"粉煤气流床气化的可行性,为促进"三高"煤高效、洁净利用提出了积极的建议.