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    振动炉排热风炉的燃烧调整方法

    2018-11-20 09:28:21 无锡盛发地坪科技有限公司 阅读

    振动炉排热风炉成都收账燃烧调整方法(1)调整热风炉成都找人公司振动频率和振动周期(振动时间和停止时间)振动炉排成都收账振动频率一般不随负荷收账变化而进行调整,最佳成都找人公司振动频率是通过观察低端炉排的挡灰板处的灰渣堆积厚度来决定的。当燃料的粒度、水分和负荷发生变化时,只是对振动时间和停止时间进行调整,振动频率一般不进行调整。

    The combustion adjustment method of vibrating grate hot blast stove (1) The vibration frequency and period (vibration time and stop time) of the vibrating grate are generally not adjusted with the change of load. The optimal vibration frequency is determined by observing the ash accumulation thickness at the ash baffle of the low grate. When the fuel particle size, moisture and load change, only the vibration time and stop time are adjusted, and the vibration frequency is generally not adjusted. 振动炉排的频率应该由下面两个因素来决定:其一是低端炉排的挡灰板处的灰渣堆积厚度,应该维持在5~10cm;其二是在一定振动频率下,不能使炉膛负压发生剧烈变化;其三是检测1号捞渣机出口的灰渣含碳量,正常的含碳量应该为5~10%。(在enkoping电厂,正常情况下,飞灰的含碳量为1~2%;灰渣的含碳量为5~10%。)。根据调整试验得出:振动炉排的频率应该为40~45赫兹。

    The frequency of vibrating grate should be determined by the following two factors: first, the ash accumulation thickness at the ash baffle of low-end grate should be maintained at 5-10 cm; second, under certain vibration frequency, the negative pressure of furnace can not change dramatically; third, the carbon content of ash at the exit of No. 1 slag dredger should be detected, and the normal carbon content should be kept. It should be 5 to 10%. (In enkoping power plant, under normal conditions, the carbon content of fly ash is 1-2%, and that of ash slag is 5-10%. According to the adjustment test, the frequency of vibrating grate should be 40~45 Hz.

    炉排的振动时间决定燃料颗粒在炉排上的行走速度(或每一振动周期内燃料在炉排上的行程),振动时间越长,其破坏焦渣的能力强,但料层内部的翻动性能差,行走速度加快;炉排的停止时间在很大程度上决定燃料颗粒在炉排上的停留时间。

    The vibration time of grate determines the walking speed of fuel particles on grate (or the travel of fuel particles on grate in each vibration cycle). The longer the vibration time, the stronger the ability of destroying coke slag. However, the turning performance of the material layer is poor and the walking speed is accelerated. The stopping time of grate largely determines the fuel particles in the grate. The length of stay.

    (2)调整炉排各区一次风的风量以及相互间匹配

    (2) adjust the air volume of the primary air in each area of the grate and match each other.

    在一次风中,中端炉排的一次风量最大,高、低端炉排的一次风量相对较少。随着热风炉负荷增加,一次风的风量占总风量的比例逐步减少。如果从炉前观察到落渣口积存较多的未燃尽的小颗粒燃料,则可以适当提高低端炉排的一次风量。

    In primary air, the primary air volume of middle-end grate is the largest, while the primary air volume of high-end grate and low-end grate is relatively small. With the increase of the load of the hot blast stove, the proportion of the primary air volume to the total air volume gradually decreases. The primary air flow of low-end grate can be increased appropriately if more unburned small granular fuel is observed in front of the grate.

    如果高端、中端炉排的炉排风量都增大,则炉排上火焰前沿向炉排高端移动;如果高端炉排的炉排风量减少、中端炉排的炉排风量增大,则炉排上火焰前沿向炉排低端移动;如果低端、中端炉排的炉排风量都增大,则炉排上火焰前沿向炉排中端移动;如果低端炉排的炉排风量减少、中端炉排的炉排风量增大,则炉排上火焰前沿向炉排低端移动。

    If the exhaust air volume of high-end and middle-end grates increases, the flame front on the grate moves towards the high-end of the grate; if the exhaust air volume of high-end grate decreases and the exhaust air volume of middle-end grate increases, the flame front on the grate moves towards the low-end of the grate; if the exhaust air volume of low-end and middle-end grate increases, the grate will be on fire. The flame front moves towards the middle end of the grate; if the air flow of the low-end grate decreases and the air flow of the middle-end grate increases, the flame front moves towards the lower end of the grate.

    (3)调整二次风和火上风

    (3) adjust the two winds and the upper wind of the fire.

    随着热风炉负荷增加,二次风的风量占总风量的比例逐步增加。各个二次风和火上风的作用如下所述。1和4为前、后墙的火上风,作为上二次风的分级配风,主要是向未燃尽的气体和燃料颗粒提供补充氧气,同时起到降低氮氧化物的作用(适当可以降低炉膛温度,因为炉膛的温度测点与火上风距离比较近);2和5为前、后墙的上二次风,主要是起到扰动和补充氧量的作用。3为前墙的下二次风,可以起到增强燃料流刚性和有助于均匀播撒燃料的作用。6为后墙下二次风,不仅起到扰动和补燃的作用,而且还可以影响燃料抛撒的长度,如果柔性管的燃料积存的比较多,可以开大6的挡板开度,阻止燃料抛撒的长度。如果燃料比较干燥或燃料的颗粒比较小,则可以增大6的挡板开度,使燃料尽可能快地燃烧,没有必要将燃料播散得更远处。

    With the increase of the load of the hot stove, the proportion of the two air volume to the total air volume gradually increases. The effects of all two winds and fire upwind are as follows. 1 and 4 are the fire upper wind of the front and rear walls. As the classified air distribution of the upper secondary air, they mainly supply oxygen to the unburned gases and fuel particles, and at the same time they play the role of reducing nitrogen oxides (appropriately reducing the furnace temperature, because the temperature measuring point of the furnace is close to the fire upper wind); 2 and 5 are the upper part of the front and rear walls. The two wind mainly acts as a disturbance and replenish oxygen. 3. The secondary air from the front wall can enhance the rigidity of fuel flow and help to distribute fuel evenly. 6 is the secondary air under the rear wall, which not only disturbs and reimburses the combustion, but also affects the length of fuel throwing. If the flexible tube has more fuel, the baffle opening of 6 can be increased to prevent the length of fuel throwing. If the fuel is drier or the fuel particles are smaller, the baffle opening of 6 can be increased to make the fuel burn as fast as possible, and there is no need to spread the fuel farther.

    (4)建立合适的炉膛负压,组织好合理的炉内燃烧空气动力场

    (4) establish suitable furnace negative pressure and organize reasonable combustion aerodynamic field in furnace.

    炉膛负压的正常运行值的范围:-50pa~—250Pa,当炉膛负压大于+0Pa(延时30秒或大于+50Pa(延时5秒)或小于-2KPa时,热风炉的MFT动作。

    The range of normal operation value of furnace negative pressure is -50pa to - 250Pa. When the furnace negative pressure is greater than + 0Pa (delay 30 seconds or more than + 50Pa (delay 5 seconds) or less than - 2KPa, the MFT action of hot blast stove.

    如果炉膛负压大于0 Pa甚至更高,首先造成高温烟气和火焰回火到给料机的落料管,引发燃料着火,对给料机、落料管和逆止挡板造成损害;其次,造成高温烟气和火焰回火到二次风的管道中,烧坏二次风的喷口,还有可能烧坏火焰监视器。还有,炉膛内的高温烟气会从人孔门或启动燃烧器的活动门的缝隙喷出,损坏设备或对人造成伤害。

    If the furnace negative pressure is greater than 0 Pa or even higher, it will first cause high temperature smoke and flame to temper to the feeder's feeder's feeder's feeder tube, causing fuel ignition, causing damage to feeder, feeder and backstop baffle; secondly, it will cause high temperature smoke and flame to temper to the secondary air pipeline, burning the nozzle of secondary air, and may also burn out. Flame monitor. In addition, the high-temperature flue gas in the furnace will eject from the crevice of the manhole door or the movable door of the burner, which will damage the equipment or cause harm to people.

    如果炉膛负压很低,首先,会缩短细小的燃料颗粒和未完全燃烧气体在炉膛中的停留时间,造成固体不完全热损失和可燃气体不完全燃烧热损失增大,降低了热风炉的燃烧效率和热效率;其次,造成热风炉的漏风量增大,造成排烟温度升高,排烟热损失增大,降低成都找人公司的热效率;还有,炉膛负压太低,则会使炉膛的水冷壁变形,拉裂焊口,对水冷壁造成损坏。

    If the furnace negative pressure is very low, firstly, the residence time of fine fuel particles and incomplete combustion gases in the furnace will be shortened, resulting in the increase of solid incomplete heat loss and flammable gas incomplete combustion heat loss, which reduces the combustion efficiency and thermal efficiency of the hot blast stove; secondly, the increase of air leakage in the hot blast stove will result in the increase of the air leakage rate of the hot blast stove. With the increase of exhaust gas temperature, the heat loss of exhaust gas increases and the thermal efficiency of hot blast stove decreases. Moreover, if the negative pressure of furnace is too low, the water wall of furnace will be deformed and the weld joint will be cracked, which will cause damage to the water wall.



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