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    使用燃气锅炉时的燃烧方式及燃烧特点
    来源:http://www.jnlzsb.com 发布时间:2021-08-30

    1、沸腾焚烧:空气以恰当流速经过布风板均匀送入炉膛,将煤粒吹起,在火床上呈沸腾(流化床)状况进行焚烧,由于煤粒与空气之间的相对运动较强烈,且在沸腾床中停留时间较长,所以焚烧大为强化。沸腾床内常安置受热面(即埋管),焚烧后的灰渣由溢流口流出。对于在其他焚烧设备上不能燃用的低质燃料(如煤歼石、石煤、油页岩等),在沸腾床中可获得安稳燃料。
    1. Boiling incineration: the air is evenly sent to the furnace through the air distributor at an appropriate flow rate to blow up the coal particles and burn them in a boiling (fluidized bed) state on the fire bed. Due to the strong relative movement between the coal particles and the air and the long residence time in the fluidized bed, the incineration is greatly strengthened. A heating surface (i.e. buried pipe) is often arranged in the fluidized bed, and the burned ash flows out from the overflow port. For low-quality fuels that cannot be burned on other incineration equipment (such as coal, stone coal, oil shale, etc.), stable fuels can be obtained in the fluidized bed.
    2、火室焚烧:燃料以粉状(煤)、雾状(油)、气态(气)伴随空气喷入炉膛进行悬浮焚烧,其设备成为室焚烧或悬燃炉。燃料的焚烧反响面积大,与空气混合良好,能够采用较小的过量空气系数,焚烧功率比火床焚烧高。
    2. Fire chamber incineration: the fuel is injected into the furnace in powder (coal), mist (oil) and gaseous (gas) with air for suspension incineration, and its equipment becomes chamber incineration or suspension combustion furnace. The combustion reaction area of fuel is large, well mixed with air, small excess air coefficient can be adopted, and the incineration power is higher than that of fire bed incineration.
    采用膜式水冷壁的燃油、燃气炉常为微正压焚烧,适宜于低氧焚烧,可下降烟气中SOx含量,减轻低温腐蚀,减少大气污染,不需引风机,只需较高压头的送风机,要求炉膛严格密封。燃气锅炉火室焚烧的使用范围主要用于部分工业锅炉,电站锅炉普遍采用这种焚烧方法。液态排渣炉的焚烧器区域温度可达1600摄氏度到1700摄氏度,
    Fuel oil and gas furnaces with membrane water wall are usually micro positive pressure incineration, which is suitable for low oxygen incineration. It can reduce the Sox content in flue gas, reduce low-temperature corrosion and reduce air pollution. There is no need for induced draft fan, only the forced draft fan with high pressure head, and the furnace is required to be strictly sealed. The application scope of gas-fired boiler fire chamber incineration is mainly used for some industrial boilers, and this incineration method is widely used in power station boilers. The incinerator area temperature of the liquid slag discharge furnace can reach 1600 ℃ to 1700 ℃,
    适于燃用灰熔点较低的煤及着火不易安稳的低挥发分煤。
    It is suitable for burning coal with low ash melting point and low volatile coal which is not easy to ignite stably.
    3、火床焚烧:燃料被层铺在炉排上、空气经炉排缝隙穿过燃料层进入炉膛,大部分燃料在炉排上进行层式焚烧,小部分细粒和从燃料层中分出的可燃气体在燃料层上部的空间进行焚烧,其设备成为火床炉,层燃炉或炉排炉。不需制粉设备,系统见到你,但遭到炉排结构尺寸的控制。使用范围:用于燃气锅炉容量小于或等于35的工业锅炉和小型电站锅炉。
    3. Fire bed incineration: the fuel is laid on the grate, and the air enters the furnace through the fuel layer through the grate gap. Most of the fuel is burned layer by layer on the grate, and a small part of fine particles and combustible gas separated from the fuel layer are burned in the space above the fuel layer. Its equipment becomes fire bed furnace, layer combustion furnace or grate furnace. Without pulverizing equipment, the system sees you, but it is controlled by the grate structure size. Scope of application: for industrial boilers and small utility boilers with gas boiler capacity less than or equal to 35.
    4、旋风焚烧:它的特点是燃料气流切向或轴向进入旋风筒内,如:细煤、粗粉。高度的二次风切向进入旋风筒内形成强烈的旋转气流,携带燃料颗粒旋转行进,大部分大颗粒被甩向筒壁熔渣膜上焚烧,小部分细分在筒内悬浮焚烧,液态渣从拍渣口流出,高温烟气进入燃尽——冷却炉膛进一步燃尽和冷却。燃料与空气的相对速度大大进步,强化了焚烧。
    4. Cyclone incineration: it is characterized by the tangential or axial flow of fuel gas into the cyclone, such as fine coal and coarse powder. The high secondary air enters the cyclone tangentially to form a strong rotating air flow and carries the fuel particles to rotate. Most of the large particles are thrown onto the slag film on the cylinder wall for incineration, and a small part is subdivided into suspension incineration in the cylinder. The liquid slag flows out from the slag tapping port, and the high-temperature flue gas enters the burnout cooling furnace for further burnout and cooling. The relative speed of fuel and air has been greatly improved and incineration has been strengthened.

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