烧结矿余热回收竖罐结构及热工参数研究

发布时间：2018-06-10 06:52

  本文选题：烧结余热 + 回收　； 参考：《东北大学》2014年硕士论文

【摘要】：竖罐式回收是本研究团队借鉴CDQ提出的一种具有自主知识产权的烧结矿余热高效回收工艺系统,其核心单元设备之一——热回收竖罐是将烧结矿显热转换为热载体即冷却风显热的关键设备。根据3类变量关系可知,余热回收竖罐的进口参数,即烧结矿显热的品质和数量,影响着竖罐的结构和操作参数,进而影响着出口参数,即热载体的品质和数量,进而影响着后续的余热发电量。基于此,本文开展余热回收竖罐的结构形式、结构参数和操作参数的初步探讨,为后续罐式回收的技术攻关和工程设计打下良好的铺垫。借鉴CDQ干熄炉结构,同时参考炼铁高炉结构,初步研究并确定了竖罐的结构形式；借鉴非流态化床气固流动与传热理论,采用解析方法,研究了竖罐的结构和操作参数,并初步确定了与360m2烧结机配套的余热回收竖罐结构参数和操作参数。主要研究结果如下：(1)确定了余热回收竖罐的总体结构形式,研究了包括竖罐本体、布料装置、布风装置、排料装置等关键零部件,在此基础上采用PROE和CAD软件绘制了罐体总装图及关键零部件图；(2)影响竖罐内气固传热的热工参数主要包括冷却风流量、罐体冷却段高度及截面尺寸、进口冷却风温度等。在生产可调节范围内,影响规律如下：1)增加冷却段高度,冷却风出口温度增加、烧结矿出口温度降低,同时出口处冷却风所携带的(?)值增加,烧结矿层阻力损失明显增大。2)增大罐体直径,冷却风和烧结矿的出口温度降低；不同直径的炯峰值对应的冷却风表观流速不同,直径越大,所对应的表观流速越小,烧结矿层阻力损失也越小。3)增大进口冷却风温度,烧结矿和冷却风的出口温度增加,出口处冷却风所携带的(?)值增加。4)要保证出口处冷却风所携带的(?)值具有较大值,综合以上分析所对应的冷却风表观流速范围1.9～4.0 m/s。(3)对于国内某360m2烧结机,可配套一个或两个竖罐。其中,配套一个竖罐的适宜热工参数为：罐体冷却段高度3.7 m、直径9.6 m,冷却风进口温度60℃,冷却风流量62.5万m3/h；配套两个竖罐的适宜热工参数为：罐体冷却段高度3.7m、直径7.6m,冷却风进口温度70℃,冷却风流量31.0万m3/h。
[Abstract]:Vertical tank recovery is a kind of high efficiency recovery process system of sinter waste heat with independent intellectual property proposed by the research team based on CDQ. One of the core unit equipments, the heat recovery vertical tank, is the key equipment for converting the sensible heat of sinter into the heat carrier, that is, cooling wind sensible heat. According to three kinds of variable relations, the inlet parameters of waste heat recovery vertical tank, that is, the quality and quantity of sinter sensible heat, affect the structure and operation parameters of vertical tank, and then affect the export parameters, that is, the quality and quantity of heat carrier. This in turn affects the subsequent generation of residual heat. Based on this, the structural form, structure parameters and operation parameters of the vertical tank for waste heat recovery are discussed in this paper, which lays a good foundation for the technical research and engineering design of the follow-up tank recovery. With reference to the structure of CDQ dry quenching furnace and the structure of iron-making blast furnace, the structure form of vertical tank is preliminarily studied and determined, and the structure and operating parameters of vertical tank are studied by using the theory of gas-solid flow and heat transfer in non-fluidized bed, using analytical method. The structural parameters and operating parameters of the waste heat recovery vertical tank matched with 360m2 sintering machine were preliminarily determined. The main research results are as follows: (1) the overall structure of the waste heat recovery vertical tank is determined, and the key components including the vertical tank body, the distribution device, the air distribution device, the discharging device, and so on, are studied. On the basis of this, the main thermal parameters affecting the gas-solid heat transfer in the vertical tank are drawn by using Proe and CAD software. The main thermal parameters affecting the gas-solid heat transfer in the vertical tank include the cooling air flow rate, the height and section size of the cooling section of the tank, the inlet cooling air temperature, and so on. In the range of adjustable production, the influence law is as follows: 1) increase the height of cooling section, increase the outlet temperature of cooling air, decrease the temperature of sinter outlet, and at the same time, increase the temperature of cooling air at the outlet. The diameter of the tank increases and the outlet temperature of cooling wind and sinter decreases, and the apparent velocity of cooling air corresponding to the peak value of different diameters is different, the larger the diameter, the smaller the apparent velocity of flow. The smaller the resistance loss of sinter ore is. 3) the higher the inlet cooling air temperature is, the higher the outlet temperature of sinter and cooling wind is, and the cooling wind at the outlet is carrying.) Value increase. 4) to ensure the cooling air carried at the outlet) For a domestic 360m2 sintering machine, one or two vertical tanks can be fitted. The suitable thermal parameters of a vertical tank are as follows: the height of the cooling section of the tank is 3.7 m, the diameter is 9.6 m, and the inlet temperature of the cooling air is 60 鈩，

本文编号：2002350