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低氮燃烧器改造后之炉渣含碳量升高

作者: 西安燃烧器厂家电 来源: 未知 时间: 2020-06-23 浏览次数:
1缺氧燃烧,煤粉燃烧不完全 1. Oxygen-deficient combustion, incomplete combustion of coal powder 经由调取氧量曲线,运行氧量普通在3%-6.0%之间,可以知足汽锅燃烧需要,且炉渣含碳量升高的同时CO浓度

1缺氧燃烧,煤粉燃烧不完全
1. Oxygen-deficient combustion, incomplete combustion of coal powder

经由调取氧量曲线,运行氧量普通在3%-6.0%之间,可以知足汽锅燃烧需要,且炉渣含碳量升高的同时CO浓度无特别升高趋势,解除缺氧燃烧的可能。
From curve of oxygen, oxygen run, generally between 3% and 6.0%, can meet the needs of the boiler combustion, and higher carbon content of slag CO concentration no abnormal rise trend at the same time, eliminate the possibility of reducing fire.

2煤粉偏粗,燃烧不完全
The coal powder is thick and incomplete

对煤粉进行取样化验,发现甲、乙、丙制粉系统煤粉较粗。煤粉细度设计值R90=25%,实际R90在30%阁下。大修后木块分手器筛网进行了替换,运行两年时间磨损严重,杂物进入粗粉分手器(轴向型)影响煤粉离散成效;磨煤机钢球历久不筛球,钢球配比错误适;粗粉星散器挡板运行中受煤粉气流冲击及检修工艺原因开度误差较大。以上三种环境是造成煤粉偏粗的首要原因。煤粉粗是炉渣含碳量升高的原因之一。
Through sampling and testing of coal powder, it was found that the coal powder in the system of a, b and c was thicker. The design value of coal powder fineness R90=25%, and the actual R90 is around 30%. After the overhaul in 2011, the screen mesh of the wooden block separator was replaced, which was badly worn in two years of operation. The entry of debris into the coarse powder separator (axial type) affected the separation effect of coal powder. The steel ball of coal mill does not sieve the ball for a long time. There is a large deviation in the opening degree of the baffle of the coarse powder separator due to the impact of coal powder air flow and the overhaul process. The above three conditions are the main reason for the thick coal powder. The coarse coal powder is one of the reasons for the increase of carbon content in slag.

低氮燃烧器

3燃烧器配风差
3. Air distribution difference of burner

低氮燃烧器革新后,机组正常运行中燃烧器配风体式为:一层及七层二次风门全开、二至六层二次风门开度为50%、SOFA风门凭据机组负荷开关(满负荷时四层燃尽风门全开),以掌握NOx浓度在300mg/m3。炉渣量升高后,将二至六层二次风门全开,始终连结一层SOFA风门全关,其余三层SOFA风门凭据机组负荷开关进行排查。经由10天的试验,炉渣含碳量没有明明转变,但NOx浓度平均升高至370mg/m3,这根基上清扫了配风原因造成炉渣含碳量升高。
N burner after modification, the unit in the normal operation of the burner air distribution mode is: a layer and seven secondary air door fully open, two to six layer secondary throttle opening is 50%, SOFA damper according to unit load switch (full four layer burning air door open), to control NOx concentration in 300 mg/m3. After the amount of slag rises, the secondary air doors of the second to the sixth floors are fully opened, and the SOFA air doors of the first floor are always fully closed. The remaining three SOFA air doors are checked according to the load switches of the unit. After 10 days' test, there was no significant change in the carbon content of slag, but the average concentration of NOx increased to 370mg/m3, which basically eliminated the increase in the carbon content of slag caused by wind distribution.

4低氮燃烧器磨损
Low nitrogen burner wear

经由燃烧器区观火孔发现部门低氮燃烧器煤粉气流根部有火星,某些低氮燃烧器区域水冷壁经常显现显著挂焦现象,由此判断低氮燃烧器磨损较严重。
Through the concept of the burner area fire hole found that some low nitrogen pulverized coal burner air roots have Mars, certain areas of low nitrogen combustion chamber wall often appear obvious coke phenomenon, which determine low nitrogen burner wear more serious.

水平浓淡燃烧器磨损原因:燃烧器与煤粉接触部位受一次风粉气流冲刷后发生遍及减薄、局部磨穿。磨穿部位集中在喷口下端面,首要是一次风喷口上摆运行时,风粉气流在喷口与方形管连系部位转向,加剧了对喷口下端面的冲刷。喷口钝体的磨损首要集中在“浓侧”,与煤粉浓度大(较“淡侧”)有关。 Causes of wear of horizontal thick and light burners: the contact area between the burners and coal powder is generally thinned and partially grinded after being washed by a wind powder airflow. The grinding position is concentrated on the lower end face of the nozzle, which is mainly when the upper end of the primary air nozzle is in operation, when the air flow turns in the joint part of the nozzle and the square pipe, the erosion of the lower end face of the nozzle is intensified. The wear of the blunt body of the nozzle is mainly concentrated on the "thick side", which is related to the high concentration of coal powder (the "weak side").

内风膜型燃烧器磨损原因:微油焚烧燃烧器浓缩星散装配位于燃烧器中央,小油枪投运时代,煤、油在燃烧器内部混烧(热负荷跨越金属部件的变形温度)时,导致低氮燃烧器内部件变形烧损。低氮燃烧器磨损、四周结焦,造成煤粉气流杂乱,煤粉不克所有集中到火焰中心燃烧,最终导致不完全燃烧损失增加,这是炉渣含碳量高的首要原因之一。同时也能注释飞灰含碳量有所升高的原因。

Endogenous wind membrane type burner abrasion reasons: micro oil ignition burner enrichment separation plant is located in the middle burner, during the operation of small oil gun, coal and oil in internal mixing burner to burn (heat load exceeds the yield temperature of the metal parts), lead to low nitrogen deformation loss items within the burner. N around the burner wear, coking, resulting in pulverized coal air flow disorder, pulverized coal into the center of the flame burning, all can't eventually led to the incomplete combustion loss increase, this is one of the main cause of the high carbon content of slag. It can also explain the increase of carbon content in fly ash.


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