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如何把燃煤热风炉改造燃气热风炉

2018-11-04 16:20:40 无锡科达脚手架厂 阅读

对于工业热风炉改流化床燃气热风炉,无论是改成循环流化床热风炉或鼓泡流化床热风炉,布风装置是流化床热风炉的关键组成部分,流态化的建立,但风帽小孔风速过大,风帽阻力增加,特别是超过40 m/s,阻力急剧增加,离心风机电耗大。流化质量的好坏,燃烧工况稳定与否,以及床的传热等都与布风装置的结构合理性关系极大。

For industrial hot-blast stove to fluidized bed gas-fired hot-blast stove, whether it is converted to circulating fluidized bed hot-blast stove or bubbling fluidized bed hot-blast stove, the air distribution device is the key component of fluidized bed hot-blast stove. The fluidization is established. However, the small hole wind speed of the cap is too high, and the resistance of the cap increases, especially over 40 m/s. The resistance increases sharply, and is separated. The wind and electricity consumption is great. The quality of fluidization, the stability of combustion conditions, and the heat transfer of the bed are all closely related to the structural rationality of the air distribution device. 布风装置一般都采用风帽型布风装置。因为在燃气热风炉改造时,为使布风均匀,在这些部位上风帽小孔直径比其他部位选得大些,使其风量约增大20%左右。目前我国流化床热风炉采用的布风布置,主要有两种型式,鼓泡流化床热风炉大多采用普通模型,循环流化床热风炉多数采用水冷风室、水冷布风板。采用这种布风装置容易施工,安全可靠,投资也少许多。

Wind distributor usually adopts wind cap type air distributor. In order to distribute air evenly, the diameter of small holes in the air cap of these parts is larger than that of other parts, which makes the air volume increase by about 20%. At present, there are two main types of air distribution used in fluidized bed hot stoves in China. The bubbling fluidized bed hot stoves mostly adopt common models, while the circulating fluidized bed hot stoves mostly adopt water-cooled air chambers and water-cooled air distributors. This kind of wind distributor is easy to construct, safe and reliable, and less investment.

现在一般采用无帽沿小直径风帽,其直径一般为40一50 mm,风帽长约175一185 mm,风帽型布风装置是由风室、布风板、风帽和保护层组成。布风要求均匀,风帽在布风板上一般按等边三角形布置。每个风帽开孔6一12个,可以单排或双排错列布置。在采用预燃室油点火时,点火风室内应浇灌耐热、保温材料,布风板应用I Cr18Ni9Ti钢板制作,厚度为20一25 mm,风帽用高硅耐热球墨铸铁制作。

Nowadays, the small diameter wind cap without hood edge is generally adopted, its diameter is 40-150 mm, and its length is about 1751-185 mm. The wind cap type air distribution device is composed of air chamber, air distributor, air cap and protective layer. Uniform wind distribution is required, and the wind cap is generally arranged on equilateral triangle on the wind distributor. Each wind cap opening 6, 12, can be arranged in single row or double row. When using pre-combustion chamber oil to ignite, the ignition chamber should be watered with heat-resistant and heat-insulating materials. The air distribution plate should be made of I Cr18Ni9Ti steel plate with a thickness of 21 125 mm, and the air cap should be made of high silicon heat-resistant nodular cast iron.

从燃气热风炉风帽小孔喷出空气速度称为小孔风速,反之,小孔风速过低,为防止给煤口附近由于给煤集中而产生流化不良和缺氧现象,该处的小孔开孔面积也需增大一些。容易造成粗颗粒沉积、底部流化不良,尤其当负荷较低时,往往不能维持运行。是布风装置设计的一个主要参数。小孔风速越大,气流对床层底部颗粒的冲动越大,扰动就愈强烈,有利于粗颗粒的流化,在低负荷时也能稳定运行,负荷调节范围较大。

The velocity of air ejected from the orifice of the hood of the gas hot blast stove is called the orifice velocity. On the contrary, the orifice velocity is too low. In order to prevent the poor fluidization and anoxic phenomena caused by the concentration of coal in the vicinity of the orifice, the orifice area of the orifice needs to be increased. It is easy to cause coarse particle deposition and poor bottom fluidization, especially when the load is low, it is often unable to maintain operation. It is a main parameter in the design of the wind distributor. The larger the orifice wind speed is, the greater the impulse of the air flow to the particles at the bottom of the bed is, the stronger the disturbance is, which is conducive to the fluidization of coarse particles. It can also operate stably at low load and has a larger load regulation range.

所以,小孔风谏应根据燃煤燃气铸铁热风炉特性及床料颗粒特性、负荷调节范围和风机电耗等方面考虑选择。在流化床四周,因为墙壁的阻挡,在冷渣管处占去了几个风帽位置,对于颗粒为0一10 mm的燃煤一般选取小孔风速为35一40m/s。对于颗粒为0一8 mm的燃煤,小孔风速为30一35m/s。燃煤真实密度大者速度取上限,密度小者取下限。

Therefore, the small hole air admonishment should be selected according to the characteristics of coal-fired and gas-fired cast iron hot blast stove and bed material particle characteristics, load adjustment range and fan power consumption. Around the fluidized bed, because of the barrier of the wall, several air caps are occupied in the slag tube. For coal combustion with 0-10 mm particles, the air velocity of the orifice is generally 35-140 m/s. For coal with a particle size of 0 to 8 mm, the wind speed of the small hole is 30 35m/s. When the real density of coal is large, the upper limit of speed is taken, and the smaller the density is, the lower limit is.



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