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Development of Dry type Fluidized High Gradient Magnetic Separation Device for Coal Powder Beneficiation

干式流态化高梯度煤粉磁选装置的研制

基本信息

批准号：
59850042
负责人：
ODA Tetsuji
金额：
$ 4.99万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1986
项目状态：
已结题

项目摘要

A novel dry type high gradient magnetic separation (HGMS) device comprized with a fluidized-bed has been developed for the purpose of coal powder beneficiation for the electric power plant. Three types of FHGMS have been tested. The basic type A consisting of parallel and straight ferro-magnetic wires was examined with parameters of wire size, number of wires, coal particle size range, magnetic flux density, carrier gas velocity, amount of feed (processed coal) and so on. The carrier gas velocity where weight of mags (trapped part on wires) is maximum, and the gas velocity where the ash reduction ratio is maximum, are found to be different. That is, the optimum gas velocity for good separation process is slightly larger than that of mags peak indicating good and characteristic separation performance of fluidization. The optimum wire size was not defined exactly, but in general, a rather thick wire ( for example, 0.8 mm in diameter) is better than a small wire ( 0.1 or 0.3 mm in diamter ), contrary to the theoretical estimation where a small wire has relatively large capturing cross section normalized with the wire cross section. From the view point of technological reason, thick and hard wire or other mechanism is desirable. New devices of FHGMS with slotted steel plates (types B and C) in place of ferro-magnetic wires were also tested. Type B with horizontally slotted steel plates shows large ash reduction, however, the coal loss factor is also very large, resulting the worst separation performance among three types. Vertically slotted steel plates type C are very well with high ash reduction ratio where coal loss is as mostly small as type A. More large scale was also tested, for example, movable long steel plates were inserted and were moved to check the semi-continuous mode operation. It was found that the gas flow inside must be examined more to realize good separation performance.

针对火电厂煤粉分选的需要，研制了一种新型的流化床干式高梯度磁选装置。已经测试了三种类型的FHGMS。对由平行和直的铁磁丝组成的基本A型，在丝径、丝数、煤粒度范围、磁感应强度、载气速度、给煤量等参数的影响下，发现丝上被捕获部分的重量最大时的载气速度和降灰率最大时的气速是不同的。也就是说，良好分离过程的最佳气速略大于mags峰的气速，表明流化的良好和特征分离性能。最佳线尺寸没有精确定义，但一般来说，相当粗的线（例如，直径为0.8mm）优于小线（直径为0.1或0.3mm），这与理论估计相反，在理论估计中，小线具有相对大的用线横截面归一化的捕获横截面。从技术原因的观点来看，粗而硬的金属丝或其它机构是理想的。用开槽钢板（B型和C型）代替铁磁导线的FHGMS新装置也进行了试验。水平钢板槽B型除灰效果好，但煤损失系数也很大，分选效果最差。垂直开槽钢板C型是非常好的，具有高的降灰率，其中煤损失与A型一样小。还测试了更大的规模，例如，插入可移动的长钢板并移动以检查半连续模式操作。发现要实现良好的分离性能，必须对内部的气体流动进行更多的检测。