為了減少大氣污染，火力發(fā)電廠要嚴(yán)格控制SO2等的排放量。因此，需要有脫硫裝置。因脫硫裝置的阻力較大，除用引風(fēng)機(jī)克服煙風(fēng)系統(tǒng)阻力外，還需要裝設(shè)脫硫增壓風(fēng)機(jī)來克服脫硫裝置的阻力。因此火電廠的脫硫氧化風(fēng)機(jī)必須具有強(qiáng)制輸送氣體的功能!而在常用的工業(yè)風(fēng)機(jī)設(shè)備中，羅茨風(fēng)機(jī)是其中性價(jià)比高而且可以滿足需求的風(fēng)機(jī)設(shè)備!因此，很多火電廠在氧化脫硫流程中，都會(huì)發(fā)現(xiàn)羅茨風(fēng)機(jī)的身影!下面，我們一起來了解下脫硫氧化中羅茨風(fēng)機(jī)的作用與位置!

　　火力電廠脫硫氧化風(fēng)機(jī)作用：煙氣中二氧化硫被漿液吸收，與石灰石反應(yīng)生成不穩(wěn)定亞硫酸鈣(或亞硫酸氫鈣)，將亞鹽氧化成硫酸鹽，需氧氣參與，氧氣來源于氧化風(fēng)機(jī)鼓入。氧化風(fēng)機(jī)大部分通過兩個(gè)或三個(gè)轉(zhuǎn)子，互相擠壓，將空氣吸入并擠出。

　　火力電廠脫硫氧化風(fēng)機(jī)原理：將石灰石粉加水制成漿液作為吸收劑，泵入吸收塔與煙氣充分接觸混合，煙氣中的二氧化硫與漿液中的碳酸鈣以及從塔下部鼓入的空氣進(jìn)行氧化反應(yīng)生成硫酸鈣，硫酸鈣達(dá)到一定飽和度后，結(jié)晶形成二水石膏。經(jīng)吸收塔排出的石膏漿液經(jīng)濃縮、脫水，使其含水量小于百分之十，然后用輸送機(jī)送至石膏貯倉堆放，脫硫后煙氣經(jīng)過除霧器除去霧滴，再經(jīng)過換熱器加熱升溫后，由煙囪排入大氣。由于吸收塔內(nèi)吸收劑漿液通過循環(huán)泵反復(fù)循環(huán)與煙氣接觸，吸收劑利用率很高，鈣硫比較低，脫硫效率可大于百分之九十。

　　為了減少大氣污染，火力發(fā)電廠要嚴(yán)格控制SO2、NOx的排放量。因此，需要有脫硫裝置。因脫硫裝置的阻力較大，除用引風(fēng)機(jī)克服煙風(fēng)系統(tǒng)阻力外，還需要裝設(shè)脫硫增壓風(fēng)機(jī)來克服脫硫裝置的阻力。增壓風(fēng)機(jī)在脫硫裝置中有多種布置方式。目前較常采用的是，對(duì)于鍋爐煙風(fēng)系統(tǒng)相對(duì)獨(dú)立的布置。

　　如圖所示，電廠脫硫系統(tǒng)中有引風(fēng)機(jī)和脫硫增壓風(fēng)機(jī),其中的脫硫增氧風(fēng)機(jī)就是羅茨風(fēng)機(jī)

　　采用這種配置方式，在脫硫系統(tǒng)中的增壓風(fēng)機(jī)或其他設(shè)備發(fā)生故障需要短期維修時(shí)，可以暫時(shí)用旁路排煙，不會(huì)影響引風(fēng)機(jī)的效率，也不必整體停爐，增加了設(shè)備的可靠性。也有脫硫裝置中不裝脫硫增壓風(fēng)機(jī)，而只有引風(fēng)機(jī)。此時(shí)引風(fēng)機(jī)要同時(shí)克服鍋爐煙風(fēng)系統(tǒng)和脫硫裝置的阻力。因此，需要提高引風(fēng)機(jī)的全壓。脫硫增壓風(fēng)機(jī)，可采用離心式風(fēng)機(jī)、動(dòng)葉可調(diào)軸流式風(fēng)機(jī)以及靜葉可調(diào)式軸流風(fēng)機(jī)，具體使用哪種風(fēng)機(jī)，應(yīng)視具體情況而定。

　　脫硫系統(tǒng)中增壓風(fēng)機(jī)的位置

　　引風(fēng)機(jī)是放在電除塵后面。

　　增壓風(fēng)機(jī)有四種布局方式：一：GGH原煙氣側(cè)之前;第二種：GGH原煙氣側(cè)與吸收塔之間;第三種：吸收塔與GGH凈煙氣側(cè)之間;第四種：GGH凈煙氣側(cè)之后。

　　優(yōu)缺點(diǎn)：一：由于煙氣流量大，增壓風(fēng)機(jī)功耗大，但是高溫?zé)煔鉁囟仍谒崧饵c(diǎn)之上，不用考慮增壓風(fēng)機(jī)的腐蝕問題，對(duì)增壓風(fēng)機(jī)材料要求低。吸收塔為正壓運(yùn)行，對(duì)提高除霧器效果有利。這種方式是被廣泛采用。第二種：煙氣溫度低，必須考慮防腐問題。另外風(fēng)機(jī)的功耗較小。但是由于風(fēng)機(jī)本身的熱阻，會(huì)造成煙氣溫度高，降低脫硫效率。第三種：此時(shí)風(fēng)機(jī)多稱為“濕風(fēng)機(jī)”，煙氣對(duì)風(fēng)機(jī)的腐蝕*強(qiáng)，對(duì)風(fēng)機(jī)材料要求較高，增加成本投入，檢修頻繁。此時(shí)吸收塔為負(fù)壓運(yùn)行，有利于氧化空氣進(jìn)入吸收塔。容易造成煙氣二次帶水，污染除霧器和下游管道。第四種：煙氣較為干燥，風(fēng)機(jī)功耗適中，但同樣需要高強(qiáng)度的防腐材料增加成本。

以上便是羅茨風(fēng)機(jī)廠家，上海瑞柘環(huán)保為您分享的脫硫氧化風(fēng)機(jī)的作用與名稱！上海瑞柘環(huán)保生產(chǎn)銷售沉水式、三葉、兩葉、密集式、真空型等不同類型的羅茨風(fēng)機(jī)！若您正在查找羅茨風(fēng)機(jī)生產(chǎn)廠家，不妨咨詢一下我們哦！

　　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.