75t/h洗煤泥循环床发电锅炉的设计与点火运行

介绍了采用浙江大学开发的异比重流化床燃烧技术,与无锡锅炉厂联合开发的国内最大的燃用洗煤泥75t/h循环流化床锅炉设计的主要技术特点、75t/h洗煤泥循环床锅炉的点火过程及运行情况.运行表明,该锅炉为中国矿区洗煤泥资源化利用提供了先进的技术手段.     

异比重煤泥循环流化床锅炉新型床料及其脱硫特性研究

研究表明石灰石完全可以替代石英砂作异比重煤泥循环流化床锅炉床料;大颗粒石灰石也可以有较好的脱硫效果,并可大幅度降低脱硫成本。     

75t/h煤泥循环流化床锅炉的开发与应用

以兴隆庄煤泥热电厂３５ｔ／ｈ煤泥流化床燃烧技术及炉前燃料系统为基础,开发研制的东滩煤泥热电厂７５ｔ／ｈ煤泥循环流化床锅炉具有的技术特点是：采用低倍率异重循环流化床,单锅筒,膜式壁布置,留有溢流渣口及底部排渣管,采用炉前立式煤泥成型给料机由炉顶给料,床下点火。试运行表明,各项参数均达到设计要求,蒸发量可达７９ｔ／ｈ,并具有较好的经济效益。     

循环流化床锅炉混烧煤泥、煤矸石的研究分析

分析了煤泥、煤矸石的特点,结合循环流化床锅炉燃烧技术的特性,指出混烧煤泥、煤矸石的可行性,论述了循环流化床锅炉设计中所采取的主要技术措施。     

循环流化床锅炉直接燃烧煤泥在实践中的应用

为了消耗煤矿选煤厂在洗选中出现的废料煤泥,冀中能源股份有限公司矸石热电厂坑口自备热电厂循环流化床锅炉进行技术改造。热电厂结合选煤厂实际状况和工艺,改变传统的燃烧煤泥方式,采用了直接掺入煤泥的方式方法燃烧煤泥。省去了压滤机压滤煤泥过程环节和专用烧煤泥系统、设备环节等。工艺简单,经济实用。通过现有的3Χ75 t/h和1Χ130t/h循环流化床锅炉中进行的直接掺入煤泥燃烧方式的实际应用,效果良好,锅炉运行安全稳定,额定出力、蒸汽温度、压力等运行参数正常。     

电石渣用于循环流化床锅炉脱硫剂可行性探讨

简要介绍热电分厂循环流化床锅炉运行现状,脱硫机理及脱硫影响因素;分析了循环流化床锅炉加入石灰石后,对锅炉燃烧及烟气排放的影响;针对电石渣用于脱硫工艺进行了探讨,论证了电石渣应用于流化床锅炉脱硫的可行性和前景。     

煤泥干燥与泵送技术对煤泥燃烧发电的影响

阐述了煤泥干燥脱水与煤泥管道泵送2种煤泥处理技术的优缺点,对比分析2种工艺对煤泥燃烧发电的影响,得出煤泥干燥后与原煤掺混入炉燃烧的处理方式不适用于煤泥综合利用电厂,而煤泥管道泵送技术是发展煤泥燃烧发电的必要环节,且日趋向大容量循环流化床锅炉大比例掺烧煤泥方向发展。     

洗煤泥煤矸石流化床混烧过程基础研究与工业应用

分析了洗煤泥、煤矸石流化床混烧过程的特点,介绍了异重流化床流体动力特性,煤泥煤矸石混烧的燃烧特性和污染物排放控制特性等方面的研究结果.该技术已在多台35 t/h及135 t/h电站锅炉上得以应用,结果表明所开发的煤泥煤矸石流化床混烧技术可在较高的燃烧效率下稳定地处理各矿区的煤泥和煤矸石, 并能达到清洁燃烧.     

国内外洗媒泥燃烧技术的发展及我们的研究

洗煤泥的燃烧处理是一个大问题,引起的了世界各国科学研究工作者的重视。本文简要介绍了国内外的洗煤泥燃烧技术的发展及我们的研究工作。其主要内容有：法国艾米路希１２．５万千瓦循环床锅炉燃烧洗煤泥浆的技术;浙江大学开发的常规流化床和循环流化床燃烧洗煤泥膏的技术;北京煤化所开发的煤与洗煤泥资源混烧的常规流化床燃烧技术和华中理工大学研究的劣质煤与洗煤泥浆两级混煤的循环化床燃烧技术。这此技术的开发,对利用洗煤泥     

循环流化床锅炉SO_2超低排放技术研究

针对循环流化床锅炉污染物生成量较低的特点,分析了锅炉SO_2生成量的影响因素,不同脱硫工艺的优缺点,结合试验研究结果和工程应用实例提出了循环流化床锅炉实现SO_2超低排放的技术。结果表明:循环流化床锅炉SO_2生成量取决于煤的硫分中可燃硫所占比例、煤灰中CaO等碱金属氧化物含量和锅炉运行参数,运行参数中床温影响最大;通过优化锅炉运行参数降低SO_2生成量,炉内干法高效脱硫和烟气脱硫相结合的深度脱硫技术可以实现SO_2超低排放的目标,并具有更高的调节灵活性和运行可靠性;烟气脱硫工艺的选取上,CFB-FGD半干法脱硫工艺相对于石灰石-石膏湿法脱硫工艺更具有经济优势。     

YG-75/5.29-M18型燃煤泥循环流化床锅炉的特点及应用

介绍了燃煤泥循环流化床锅炉在输送系统、喷枪结构、给料方式及分离器等方面的技术特点;论述了燃烧煤泥时对流化床温度、返料器温度、料层差压、炉膛差压和锅炉负荷等参数的控制与调整;应用此锅炉燃用煤泥或矸石,可降低生产成本,获得较好的经济效益。     

Emissions of NOx and N2O during co-combustion of dried sewage sludge with coal in a circulating fluidized bed combustor

Emissions of NO_x and N₂O were measured during mono-combustion of dried sewage sludge and co-combustion with coal in a bench-scale circulating fluidized bed combustor (CFBC). The results were compared with previous results obtained using a bubbling fluidized bed combustor (BFBC). The increase in NO_x with sludge ash accumulation in the combustor was less for the CFBC than the BFBC, partly because of the higher attrition rate of sludge ash in CFBC resulting from the higher gas velocity. The influence of sludge ash on the formation of NO_x in CFBC was less than that in BFBC during sludge combustion. The effects of fuel type on NO_x and N₂O emissions were also evaluated.     

A technical and environmental analysis of co-combustion of coal and biomass in fluidised bed technologies

The use of biomass, which is considered to produce no net CO₂ emissions in its life cycle, can reduce the effective CO₂ emissions of a coal-fired power generation system, when co-fired with the coal, but may also reduce system efficiency.The technical and environmental analysis of fluidised bed technologies, using the ECLIPSE suite of process simulation software, is the subject of this study. System efficiencies for generating electricity are evaluated and compared for the different technologies and system scales.Several technologies could be applied to the co-combustion of biomass or waste and coal. The assessment studies here examine the potential for co-combustion of (a) a 600 MWe pulverised fuel (PF) power plant (as a reference system), (i) co-firing coal with straw and sewage sludge and (ii) using straw derived fuel gas as return fuel; (b) a 350 MWe pressurised fluidised bed combustion (PFBC) system co-firing coal with sewage sludge; (c) 250 MWe and 125 MWe circulating fluidised bed combustion (CFBC) plants co-firing coal with straw and sewage sludge; (d) 25 MWe CFBC systems co-firing low and high sulphur content coal with straw, wood and woody matter pressed from olive stones (WPOS); (e) 12 MWe CFBC co-firing low and high sulphur content coal with straw or wood; and (f) 12 MWe bubbling fluidised bed combustion (BFBC), also co-firing low and high sulphur content coal with straw or wood.In the large systems the use of both straw and sewage sludge resulted in a small reduction in efficiency (compared with systems using only coal as fuel).In the small-scale systems the high moisture content of the wood chips chosen caused a significant efficiency reduction.Net CO₂ emissions are reduced when biomass is used, and these are compared for the different types and scales of fluidised bed technologies. NO_x emissions were affected by a number of factors, such as bed temperature, amount of sorbent used for SO₂ capture and HCl emitted.     

A Techno-economic assessment of the reduction of carbon dioxide emissions through the use of biomass co-combustion

Using sustainably-grown biomass as the sole fuel, or co-fired with coal, is an effective way of reducing the net CO₂ emissions from a combustion power plant. There may be a reduction in efficiency from the use of biomass, mainly as a result of its relatively high moisture content, and the system economics may also be adversely affected.The economic cost of reducing CO₂ emissions through the replacement of coal with biomass can be identified by analysing the system when fuelled solely by biomass, solely by coal and when a coal-biomass mixture is used.The technical feasibility of burning biomass or certain wastes with pulverised coal in utility boilers has been well established. Cofiring had also been found to have little effect on efficiency or flame stability, and pilot plant studies had shown that cofiring could reduce NO_x and SO_x emissions.Several technologies could be applied to the co-combustion of biomass or waste and coal. The assessment studies here examine the potential for co-combustion of (a) a 600 MWe pulverised fuel (PF) power plant, (i) cofiring coal with straw and sewage sludge and (ii) using straw derived fuel gas as return fuel; (b) a 350 MWe pressurised fluidised bed combustion (PFBC) system cofiring coal with sewage sludge; (c) 250 and 125 MWe circulating fluidised bed combustion (CFBC) plants cofiring coal with straw and sewage sludge; (d) 25 MWe CFBC systems cofiring low and high sulphur content coal with straw, wood and woody matter pressed from olive stones (WPOS); and (e) 12 MWe CFBC cofiring low and high sulphur content coal with straw.The technical, environmental and economic analysis of such technologies, using the ECLIPSE suite of process simulation software, is the subject of this study. System efficiencies for generating electricity are evaluated and compared for the different technologies and system scales. The capital costs of systems are estimated for coal-firing and also any additional costs introduced when biomass is used. The Break-even electricity selling price is calculated for each technology, taking into account the system scale and fuel used.Since net CO₂ emissions are reduced when biomass is used, the effect of the use of biomass on the electricity selling price can be found and the premium required for emissions reduction assessed. Consideration is also given to the level of subvention required, either as a Carbon dioxide Credit or as a Renewable Credit, to make the systems using biomass competitive with those fuelled only with coal.It would appear that a Renewable Credit (RC) is a more transparent and cost-effective mechanism to support the use of biomass in such power plants than a Carbon dioxide Credit (CC).     

红球菌对神府煤的脱硫作用研究

从污泥中分离得到红球菌,研究了该菌在MBS培养基中对肥煤的脱硫效果。分析了煤粒度、曝气情况、pH值、溶液渗透压等因素对该菌株脱硫的影响,分别测定了全硫、无机硫、煤的红外特征图的变化等情况,在全硫测定条件下结果表明,该菌株脱硫效率高,在曝气情况下14天可达到92%。从红外分析表明,该菌株主要作用于煤中有机硫,且效果良好。     

煤泥循环流化床锅炉低温脱硫的研究

介绍了煤泥循环流化床锅炉实现低温脱硫的方案:首先调整锅炉运行状态,在稍微提高总风量的前提下,适当减少二次风量,增加一次风量;然后对锅炉局部进行改进,提高布风板流化风速,增加炉膛受热面吸热量;改造后煤泥循环流化床锅炉可以在900℃左右满负荷稳定运行,降低了SO2、NOx的排放浓度。     

Utilization of fly ash coming from a CFBC boiler co-firing coal and petroleum coke in Portland cement

Fly ash coming from a circulating fluidized bed combustion (CFBC) boiler co-firing coal and petroleum coke (CFBC fly ash) is very different from coal ash from traditional pulverized fuel firing due to many differences in their combustion processes, and thus they have different effects on the properties of Portland cement. The influences of CFBC fly ash on the strength, setting time, volume stability, water requirement for normal consistency, and hydration products of Portland cement were investigated. The results showed that CFBC fly ash had a little effect on the strength of the Portland cement when its content was below 20%, but the strength decreased significantly if the ash content was over 20%. The water requirement for normal consistency of cement increased from 1.8% to 3.2% (absolute increment value) with an addition of 10% CFBC fly ash; and the free lime (f-CaO) content of CFBC fly ash affected the value of increasing. The setting time decreased with an increase of CFBC fly ash content. The volume stability of the cement was qualified even when the content of SO₃ and f-CaO reached 4.48% and 3.0% in cement, respectively. The main hydration productions of cement with CFBC fly ash were C-S-H (hydrated calcium silicate), AFt (ettringite), and portlandite.     

利用差示扫描量热法测定CFBC脱硫灰中残留碳的研究

借助差示扫描量热分析仪对煤与高硫石油焦混烧排放的CFBC(循环流化床)脱硫灰的残留碳含量进行了测定,研究表明:(1)CFBC脱硫灰的热反应过程主要分为水分和挥发分逸出,碳氧化和矿物分解及继续反应等三个阶段.(2)是否含有氢氧钙石对CFBC脱硫灰的热反应过程影响很大,含有氢氧钙石的CFBC脱硫灰在碳氧化和矿物分解阶段(约...     

新型钡基高温燃烧固硫剂的研究与应用

引　言燃烧脱硫技术是在高温燃烧过程中将煤中的硫转化为硫酸盐或硫化物 ,因而其固硫率与硫酸盐或硫化物的热力学形成过程密切相关 .据文献报道 ,ＣａＳＯ3和ＣａＳＯ4 分别在 10 0 4℃[1] 和 1195～ 12 14℃[2 ] 就已开始分解 .纯ＣａＳＯ4 在 12 5 0℃高温下的分解率为 85 % .纯ＢａＳＯ4 的分解温度为 15 80℃[3] ,大大高于ＣａＳＯ4 ,显示较高的热稳定性 .根据元素周期表递变规律 ,位于第 6周期的Ｂａ较位Ｆｉｇ .1　Ｓｃｈｅｍａｔｉｃｏｆｉｎｔｅｌｌｉｇｅｎｔｓｕｌｆｕｒｄｅｔｅｒｍｉｎａｔｉｏｎ1—ｍａｉｎｆｒａｍｅｏｆｉｎ…