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火电厂的脱硫氧化风机叫什么名字?其作用是什么?

What is the name of the desulfurization and oxidation fan in thermal power plant? What is its function?

发布时间:2022-07-25 14:49:11 人气:105 点赞:0

  为了减少大气污染,火力发电厂要严格控制SO2等的排放量。因此,需要有脱硫装置。因脱硫装置的阻力较大,除用引风机克服烟风系统阻力外,还需要装设脱硫增压风机来克服脱硫装置的阻力。因此火电厂的脱硫氧化风机必须具有强制输送气体的功能!而在常用的工业风机设备中,罗茨风机是其中性价比高而且可以满足需求的风机设备!因此,很多火电厂在氧化脱硫流程中,都会发现罗茨风机的身影!下面,我们一起来了解下脱硫氧化中罗茨风机的作用与位置!

  火力电厂脱硫氧化风机作用:烟气中二氧化硫被浆液吸收,与石灰石反应生成不稳定亚硫酸钙(或亚硫酸氢钙),将亚盐氧化成硫酸盐,需氧气参与,氧气来源于氧化风机鼓入。氧化风机大部分通过两个或三个转子,互相挤压,将空气吸入并挤出。

  火力电厂脱硫氧化风机原理:将石灰石粉加水制成浆液作为吸收剂,泵入吸收塔与烟气充分接触混合,烟气中的二氧化硫与浆液中的碳酸钙以及从塔下部鼓入的空气进行氧化反应生成硫酸钙,硫酸钙达到一定饱和度后,结晶形成二水石膏。经吸收塔排出的石膏浆液经浓缩、脱水,使其含水量小于百分之十,然后用输送机送至石膏贮仓堆放,脱硫后烟气经过除雾器除去雾滴,再经过换热器加热升温后,由烟囱排入大气。由于吸收塔内吸收剂浆液通过循环泵反复循环与烟气接触,吸收剂利用率很高,钙硫比较低,脱硫效率可大于百分之九十。

  为了减少大气污染,火力发电厂要严格控制SO2、NOx的排放量。因此,需要有脱硫装置。因脱硫装置的阻力较大,除用引风机克服烟风系统阻力外,还需要装设脱硫增压风机来克服脱硫装置的阻力。增压风机在脱硫装置中有多种布置方式。目前较常采用的是,对于锅炉烟风系统相对独立的布置。

电厂脱硫系统中有引风机和脱硫增压风机,其中的脱硫增氧风机就是罗茨风机

  如图所示,电厂脱硫系统中有引风机和脱硫增压风机,其中的脱硫增氧风机就是罗茨风机

  采用这种配置方式,在脱硫系统中的增压风机或其他设备发生故障需要短期维修时,可以暂时用旁路排烟,不会影响引风机的效率,也不必整体停炉,增加了设备的可靠性。也有脱硫装置中不装脱硫增压风机,而只有引风机。此时引风机要同时克服锅炉烟风系统和脱硫装置的阻力。因此,需要提高引风机的全压。脱硫增压风机,可采用离心式风机、动叶可调轴流式风机以及静叶可调式轴流风机,具体使用哪种风机,应视具体情况而定。

  脱硫系统中增压风机的位置

  引风机是放在电除尘后面。

  增压风机有四种布局方式:一:GGH原烟气侧之前;第二种:GGH原烟气侧与吸收塔之间;第三种:吸收塔与GGH净烟气侧之间;第四种:GGH净烟气侧之后。

  优缺点:一:由于烟气流量大,增压风机功耗大,但是高温烟气温度在酸露点之上,不用考虑增压风机的腐蚀问题,对增压风机材料要求低。吸收塔为正压运行,对提高除雾器效果有利。这种方式是被广泛采用。第二种:烟气温度低,必须考虑防腐问题。另外风机的功耗较小。但是由于风机本身的热阻,会造成烟气温度高,降低脱硫效率。第三种:此时风机多称为“湿风机”,烟气对风机的腐蚀*强,对风机材料要求较高,增加成本投入,检修频繁。此时吸收塔为负压运行,有利于氧化空气进入吸收塔。容易造成烟气二次带水,污染除雾器和下游管道。第四种:烟气较为干燥,风机功耗适中,但同样需要高强度的防腐材料增加成本。

以上便是罗茨风机厂家,上海瑞柘环保为您分享的脱硫氧化风机的作用与名称!上海瑞柘环保生产销售沉水式、三叶、两叶、密集式、真空型等不同类型的罗茨风机!若您正在查找罗茨风机生产厂家,不妨咨询一下我们哦!

  In order to reduce air pollution, thermal power plants should strictly control SO2 and other emissions. Therefore, a desulfurization unit is required. Due to the high resistance of desulfurization unit, besides overcoming the resistance of flue gas system with induced fan, it is also necessary to install a desulfurization booster fan to overcome the resistance of desulfurization unit. Therefore, the desulfurization and oxidation fan of thermal power plant must have the function of forcing gas transmission! Roots blower is one of the most popular industrial fan equipments, which has a high cost-effective and can meet the demand. Therefore, many thermal power plants will find Roots blower in the process of oxidation desulfurization! Next, let us know the function and position of Roots blower in desulfurization and oxidation together!

  Function of desulfurization and oxidation fan in thermal power plant: SO2 in flue gas is absorbed by slurry and reacts with limestone to form unstable calcium sulfite (or calcium bisulfite). The sulfite is oxidized to sulfate with participation of oxygen. Oxygen comes from blower of oxidation fan. Most of the oxidation fans squeeze each other through two or three rotors, sucking air in and squeezing it out.

  Principle of desulfurization and oxidation fan in thermal power plant: limestone powder is added with water to make slurry as absorbent, and then pumped into absorption tower to make full contact with flue gas. Sulfur dioxide in flue gas reacts with calcium carbonate in slurry and air from lower part of tower to form calcium sulfate. Calcium sulfate crystallizes to form gypsum dihydrate after reaching certain saturation. The gypsum slurry discharged from the absorption tower is concentrated and dewatered so that its water content is less than 10%. Then it is sent to the gypsum storage bin for stacking with a conveyor. After desulfurization, the flue gas is removed by the demister and heated by the heat exchanger to raise temperature. Then it is discharged into the atmosphere by the chimney. As the absorbent slurry in the absorber tower contacts the flue gas repeatedly through the circulating pump, the utilization ratio of absorbent is very high, the calcium and sulfur ratio is relatively low, and the desulfurization efficiency can be more than 90%.

  In order to reduce air pollution, thermal power plants should strictly control SO2 and NOx emissions. Therefore, a desulfurization unit is required. Due to the high resistance of desulfurization unit, besides overcoming the resistance of flue gas system with induced fan, it is also necessary to install a desulfurization booster fan to overcome the resistance of desulfurization unit. The supercharged fan is arranged in various ways in the desulfurization unit. At present, relatively independent arrangement of boiler flue-air system is adopted.

  In the desulphurization system of power plant, there are induced draft fan and desulphurization booster fan, of which the desulphurization and oxygen booster fan is Roots blower.

  As shown in the diagram, there are induced draft fan and supercharged desulfurization fan in the desulfurization system of power plant, in which the desulfurization and oxygen booster fan is the Roots blower.

  With this configuration, when the supercharged fan or other equipment in the desulfurization system fails and needs short-term maintenance, the smoke can be temporarily exhausted by bypass, which will not affect the efficiency of the induction fan and do not need to shut down the boiler as a whole, thus increasing the reliability of the equipment. There are also desulfurization units without supercharged fan for desulfurization, but only induced fan. At this time, the induced draft fan should overcome the resistance of boiler flue-air system and desulfurization device at the same time. Therefore, it is necessary to increase the full pressure of the induced draft fan. The centrifugal fan, axial fan with adjustable moving blades and axial fan with adjustable stationary blades can be used for desulfurization and boosting fan. The specific type of fan to be used depends on the specific conditions.

  Position of booster fan in desulfurization system

  The induced draft fan is placed behind the electric dust removal.

  There are four layout modes for supercharged fan: the first one is before the original fume side of GGH; The second type is between the original fume side of GGH and the absorption tower. The third type is between the absorber and the GGH net fume side. Fourth type: behind the GGH net fume side.

  Advantages and disadvantages: First, the power consumption of the booster fan is the highest due to the large flue gas flow, but the high temperature flue gas temperature is above the acid dew point, so the corrosion problem of the booster fan is not considered and the material requirement for the booster fan is low. The absorption tower operates at positive pressure, which is beneficial to improve the defogger effect. This method is widely used. Second: low temperature of flue gas, corrosion protection must be considered. In addition, the power consumption of the fan is small. However, due to the thermal resistance of the fan itself, the flue gas temperature will be high and the desulfurization efficiency will be reduced. The third type: at this time, the blower is mostly called "wet blower". The flue gas has the strongest corrosion on the blower, requiring higher material for the blower, increasing cost input and frequent maintenance. At this time, the absorber operates under negative pressure, which facilitates the entry of oxidized air into the absorber. It is easy to cause secondary water carryover of flue gas, pollution of demister and downstream pipeline. Fourth: The flue gas is dry and the power consumption of the fan is moderate, but it also needs high-strength anticorrosive material to increase the cost.


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