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回轉(zhuǎn)式GGH吹灰系統(tǒng)與AF泡沫泵材質(zhì)，回轉(zhuǎn)式GGH受熱面布置較緊密，氣流酒道狹窄，曲折，煙氣中的飛灰易沉積在受熱面上，造成堵灰，使氣流阻力和風機電耗增大，傳熱面積減少，熱風溫度降低，積灰還會加劇腐蝕，影響脫硫換熱器正常工作，因此必須設(shè)置吹灰系統(tǒng)?；剞D(zhuǎn)式GGH通常配有壓縮空氣(或蒸汽)吹掃、在線高壓水(8-12MPa)沖洗和離線大流量低壓水(O.5MPa左右)沖洗裝置。這三種方式在同一吹灰槍上實現(xiàn)。回轉(zhuǎn)式GCH正常工作時，壓縮空氣吹灰每班運行次，當吹灰后換熱器壓降仍高于設(shè)計值時，則啟動高壓沖洗水進行在線沖洗，由此雙重吹灰方式來保證吹灰效果(建議定期高壓水在線沖洗至少每月一次)。回轉(zhuǎn)式GGH停運檢修時使用大流量低壓沖洗水沖洗換熱器。壓縮空氣吹灰時，GGH的正常轉(zhuǎn)速為1.5s/min在高壓或低壓水中洗時轉(zhuǎn)速為0.5r/min,雖然采用了雙重吹灰方式，但由于回轉(zhuǎn)式GGH存在低溫段容易堵灰問題，因此，蒸汽吹灰的形式正在被采用。
當然用高硫煤時，煙氣的酸露點較高。在這種情況下，采用蒸汽吹灰對受熱面及隔欄不利，吹灰蒸汽所帶入的水分會加劇受熱面的酸腐蝕。如果吹灰器行程機構(gòu)卡澀，蒸汽對局部的沖擊影響元件的壽命。同時檢修時，沖洗水也將凝結(jié)在受熱面上把酸露稀釋成稀酸，從而加劇腐蝕。雖然蒸汽吹灰有以上不利情況，但由于蒸汽壓力高，溫度高，沖擊力強，相對壓縮空氣面言有更好的吹灰效果。壓縮空氣雖然水汽含量很低，但溫度較低，沖擊力與蒸汽相比也較低，對積灰的清除效果不好。此外，由于吹灰蒸汽耗量較大(約3t/h)，而壓縮空氣系統(tǒng)難以承受，因此吹灰介質(zhì)采用蒸汽比采用壓縮空氣合適，經(jīng)實踐證明，效果良好?；剞D(zhuǎn)式GGH沖洗系統(tǒng)有三種類型，AF泡沫泵
Rotary GGH soot blowing system is made of AF foam pump material. Rotary GGH heating surface is arranged tightly. The airflow channel is narrow and winding. Fly ash in flue gas is easy to deposit on heating surface. It causes ash blocking, increases airflow resistance and fan power consumption, reduces heat transfer area, reduces hot air temperature, and aggravates corrosion, and affects the normal operation of desulfurization heat exchanger. Therefore, soot blowing system must be set up. Unification. Rotary GGH is usually equipped with compressed air (or steam) purging, on-line high pressure water (8-12 MPa) flushing and off-line large flow low pressure water (about O.5 MPa) flushing devices. These three methods are implemented in the same soot blower. When the rotary GCH works normally, the compressed air soot blowing is operated every shift. When the pressure drop of heat exchanger after soot blowing is still higher than the design value, the high-pressure flushing water is started for on-line flushing. Thus, the dual soot blowing method ensures the soot blowing effect (it is recommended that the high-pressure water be flushed online at least once a month at regular intervals). Large flow and low pressure flushing water is used to flush the heat exchanger when the rotary GGH is out of service and overhaul. The normal speed of GGH is 1.5s/min when it is washed in high pressure or low pressure water. Although dual soot blowing method is adopted, because the low temperature section of rotary GGH is easy to block up, the form of steam soot blowing is being adopted.
Of course, when high sulfur coal is used, the acid dew point of flue gas is higher. In this case, the use of steam soot blowing is not conducive to the heating surface and barrier, and the water brought by the soot steam will aggravate the acid corrosion of the heating surface. If the travel mechanism of the sootblower is jammed, the impact of steam on the part will affect the life of the component. At the same time, the washing water will also condense on the heating surface and dilute the acid dew to dilute acid, thus aggravating corrosion. Although steam soot blowing has the above disadvantages, it has better soot blowing effect than compressed air because of the high steam pressure, high temperature and strong impact. Compressed air has a low water vapor content, but its temperature is lower, and its impact force is lower than that of steam, which has a bad effect on ash removal. In addition, because the steam consumption of soot blowing is large (about 3t/h), and the compressed air system is difficult to bear, it is appropriate to use steam as soot blowing medium than compressed air. Practice has proved that the effect is good. There are three types of rotary GGH flushing system, AF foam pump.
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