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Flue gas cooling waste heat utilization

一般一台 1 00t/h 锅炉 排烟温度从 1 30 降低到 1 00 可回收余热 2 200KW 折合低压蒸汽 3 t/h 左右 ,年节能效益约 2 00 万元 Power plant boiler flue gas waste heat is very huge , generally a 100t / h boiler , the exhaust temperature is reduced from 1 30 to 100 , the waste heat can be recovered 2 200KW , equivalent to about 3 t / h of low pressure steam , annual energy saving benefits About 2 million yuan . Reducing the temperature of the flue gas is also beneficial to improving the desulfurization efficiency, reducing the water consumption of the desulfurization, reducing the moisture content of the flue gas, and also beneficial to the subsequent whitening of the flue gas. 20 都应该设置烟气冷却器 使烟温降低到 1 00 左右 Therefore, if the temperature of the boiler before desulfurization is higher than 120 ° C , a flue gas cooler should be installed to reduce the flue gas temperature to around 100 ° C.

也可以安排在除尘器后 The flue gas cooler can be arranged in front of the dust collector or behind the dust collector . 烟气温度不能太低 因此最好安装在除尘器后面 这对烟气冷却器的运行也是有利的 Since bag dust collectors are commonly used in thermal power plants , the flue gas temperature cannot be too low , so it is best to install them behind the dust collector , which is also beneficial to the operation of the flue gas cooler .

传热温差大 面积和阻力都比较小 The cooling medium of the flue gas cooler uses desalinated water . The heat transfer temperature difference is large , and the area and resistance are relatively small . 烟气温度降低 30 除盐水温度可以升高 1 5 可相应减少除氧器的蒸汽耗量 达到节能目的 For heating units , the flue gas temperature is reduced by 30 ° C , and the temperature of demineralized water can be increased by 15 ° C , which can correspondingly reduce the steam consumption of the deaerator and achieve energy saving purposes . GGH 的循环水 升温后用于脱硫烟气的加热 Circulating water of M GGH can also be used for heating the desulfurized flue gas after heating .

S S2205 P TFE The material of the flue gas cooler is generally S S2205 , P TFE, etc. TFE 为聚四氟乙烯 具有最好的抗腐蚀性和防粘附性 ,但尺寸和阻力较大,价格很高。 P TFE is polytetrafluoroethylene , which has the best corrosion resistance and anti-adhesion properties , but it has a large size and resistance and a high price. D 钢适合在烟气露点温度附近及以上使用 使用范围狭窄 ,不适合做烟气冷却器。 N D steel is suitable for use near and above the flue gas dew point temperature . The use range is narrow and it is not suitable as a flue gas cooler. S2205 具有很强的抗腐蚀性 可以做成翅片管 因此尺寸小阻力小 S S2205 has strong corrosion resistance and can be made into a finned tube , so it has a small size and small resistance .



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