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.
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) adjust the air volume of the primary air in each area of the grate and match each other.
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.
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) adjust the two winds and the upper wind of the fire.
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) establish suitable furnace negative pressure and organize reasonable combustion aerodynamic field in furnace.
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.
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.
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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